There is no legal upper age limit for commercial divers in the UK or the US. The UK regulations set no lower or upper limit, but nobody under 18 is accepted for offshore work. In the US, OSHA's diving standard sets no age at all, and the ADCI says there is "no minimum or maximum age limit" as long as the medical standards are met, though it won't issue cards to anyone under 18. US schools typically require you to be 18. The real limits are practical: an annual diving medical with a fitness test and closer heart checks as you get older, the years you have left to earn back the cost of training, and the four to six years it usually takes to reach saturation. People do start at 35 or 40. Starting at 45 or later is legal, but the maths and the medical get harder.
"Am I too old?" is one of the most common questions from people thinking about commercial diving as a second career. The answers online come mostly from forums, and they range from "no limit, go for it" to "forget it after 30".
Both are too simple. The rules themselves are clear, and we quote them below from the UK Health and Safety Executive (HSE), OSHA, the ADCI and the schools. What decides whether it makes sense for you is the medical, the money and the time you have left. We go through each one with sources, and with a worked example you can redo with your own numbers.
The legal answer, regime by regime
The short version: the rules set a minimum age in practice (18 for offshore work and for most schools) and no maximum anywhere we checked. What they require instead is that you are medically fit, every year.
| Regime / body | Minimum age | Maximum age | What actually gates you |
|---|---|---|---|
| UK: Diving at Work Regulations 1997 (HSE) | None set in law; nobody under 18 accepted offshore | None | Certificate of medical fitness to dive from an HSE-approved doctor, valid for up to 12 months |
| US: OSHA 29 CFR 1910 Subpart T | Not specified | Not specified | Training and experience for the assigned tasks (§1910.410) |
| ADCI (US industry standard) | No cards issued under 18 | None "providing all the medical standards can be met" | ADCI physical, with extra heart checks from age 35 |
| US schools (examples) | 18 (Divers Institute of Technology, Ocean Corporation) | "No cut off age" (DIT); "no maximum age limit" (Ocean Corp.) | Dive physical, high-school diploma or GED, swim test |
| UK school (example) | Not stated | "No age limit" if you pass the HSE diver medical (The Underwater Centre) | HSE diving medical |
Sources: HSE diving FAQs; HSE MA1 (2023), para. 36; OSHA §1910.410; ADCI International Consensus Standards 6.5, section 2.4, as reproduced by Ocean Corporation; DIT requirements; Ocean Corp. admissions; The Underwater Centre FAQ. Checked 28 September 2026.
United Kingdom (HSE)
The HSE answers the question directly in its diving FAQs: "There is no lower or upper age limit set for divers. However, it is unusual for anyone below school-leaving age to undergo commercial diver training and no one under 18 is accepted for work offshore."
The HSE's guidance for diving doctors (MA1, June 2023) says the same: the Diving at Work Regulations "do not specify lower or upper age limits for professional diving", and "the minimum age for working offshore is 18 years". So in the UK your age is never a reason in law to refuse you. Your medical can be.
United States (OSHA and ADCI)
OSHA's commercial diving standard (29 CFR 1910 Subpart T) doesn't mention age. Its qualification rule, §1910.410, is about competence: each dive team member needs experience or training in the tools, the diving mode and the emergency procedures, plus CPR and first aid.
The ADCI consensus standards, which most US contractors and schools work to, state: "There is no minimum or maximum age limit, providing all the medical standards can be met. The ADCI does not issue commercial diver certification cards to persons younger than 18 years of age." In practice, then, 18 is the entry age in the US too.
Schools
Schools set their own entry rules, and the ones we checked agree. Divers Institute of Technology in Seattle requires applicants to be "18 years of age or older" and says there is "no cut off age to attend". Ocean Corporation in Houston says "there is no maximum age limit, so mid-career professionals seeking a new direction are welcome to apply". In the UK, The Underwater Centre says there is "no age limit provided you are healthy and fit enough to pass an HSE diver medical".
For a side-by-side view of US programmes, see our comparison of commercial diving schools in the USA.
The practical limits: medical, fitness and employers
The rules set no age limit, so the question becomes whether you can pass the medical every year, and keep passing it. That gets harder with age for most people, and the standards say so openly.
The annual medical
In the UK every diver at work needs a certificate of medical fitness from an Approved Medical Examiner of Divers (AMED). MA1 says it is "valid for up to 12 months". You need it before training and then every year you dive. What the exam covers is set out in our guide to the commercial diving medical certificate.
Age is not an item on the form. But several things that do count tend to change with age: blood pressure, weight, lung function, heart risk and fitness.
The fitness test has no age allowance
At each HSE medical, the doctor runs a Chester Step Test to estimate your VO2 max, a measure of aerobic fitness. MA1 gives the doctor a guide for reading the result:
| Estimated VO2 max (ml/kg/min) | What MA1 suggests |
|---|---|
| Above 44 | 12-month certificate, if the rest of the medical is satisfactory |
| 40 to 44 | Short-duration certificate and re-test, or a 12-month certificate restricted to a specific diving activity |
| Below 40 | Unfit certificate (with limited exceptions for less demanding recreational, media or scientific diving) |
Source: HSE, Medical examination and assessment of working divers (MA1), June 2023, paras. 52–58 and Table 1.
The thresholds are the same at 22 and at 48. Aerobic fitness tends to fall with age unless you train for it, so an older candidate usually has to work harder to stay above 44. It's a threshold you can train for. Our guide to the commercial diving physical test covers how to prepare.
US medical: extra heart checks from 35
The ADCI medical guidelines don't use age as a cut-off, but they do add tests as you get older:
- ECG: "required on initial examinations and annually after the age of 35".
- Lipid panel: "required annually after the age of 35".
- Heart risk score: the ADCI uses the Framingham risk calculator "rather than using an age based criteria". If your calculated risk is 10% or more, a stress test is recommended. Age is one of the inputs, so the score tends to rise over time.
- Stress testing, when done: the guidelines ask for the Bruce protocol through stage III to at least 10 METs without signs of ischaemia.
The ADCI also says that divers need "adequate reserves of pulmonary and cardiovascular fitness for use in an emergency", and that "the lack of these reserves may possibly lead to the termination of a professional diving career". That is the practical age limit, written down.
Employers and clients
Beyond the medical, individual contractors and their clients can set their own hiring requirements. We have not found a published industry-wide age cap, and we won't guess at one. What older entrants do report is a more practical problem. A new diver at 42 starts on deck as a tender, alongside 20-year-olds, on the same pay. Ask the schools you're considering what their graduates of your age are doing a year after finishing. A good school will give you a straight answer.
Starting at 30, 35, 40 or 45: the payback maths
This is where age really matters. Training is expensive, and the first years pay less than the headline figures suggest. The later you start, the fewer years you have to earn the investment back.
What training costs
Divers Institute of Technology publishes the most complete US budget: $29,000 tuition, and $48,800 total cost of attendance once gear, the physical, housing, food and travel are added (DIT cost of attendance). Other US programmes and all their prices are in our US schools comparison, and the general breakdown is in how much a commercial diving course costs.
What the first years pay
In May 2025 the median US commercial diver earned $72,990 a year. The bottom 10% earned less than $43,330 (BLS OEWS via O*NET). New divers usually start near the bottom of that range, working as tenders. The full picture, including UK day rates, is in our underwater welder and commercial diver salary guide.
Worked example
Assume a total cost of $48,800 (the DIT figure) and a gross pay rise, compared with your current job, of $10,000, $20,000 or $30,000 a year once you're established. Then count how many working years you'd have in the water before 55. We picked 55 as an assumption for illustration only. Many divers stop earlier, some go later, and it depends on the medical.
| Starting age | Years in the water to 55 | Payback at +$10k/yr | Payback at +$20k/yr | Payback at +$30k/yr |
|---|---|---|---|---|
| 25 | ≈ 29 | ≈ 4.9 years | ≈ 2.4 years | ≈ 1.6 years |
| 30 | ≈ 24 | |||
| 35 | ≈ 19 | |||
| 40 | ≈ 14 | |||
| 45 | ≈ 9 |
Calculation by satdiver.com: $48,800 ÷ annual gross gain. Years in the water = 55 minus starting age, minus about one year for school and job search. Before tax. It ignores interest, lost income during training and the first low-paid tender years, all of which lengthen the payback. Illustration only, not a forecast.
Two things stand out. The payback time is the same at every age: it depends on the pay gain, not on how old you are. What changes is the margin for error. At 25 a slow first two years barely matter. At 45, two slow years plus one failed medical can wipe out most of the return.
The second point is the one people miss. If you already earn more than an entry-level diver, your "gain" is negative for the first year or two. Someone on $55,000 today who starts at the 10th-percentile diver wage ($43,330) is about $11,700 a year worse off until they move up. For career changers in their late thirties and forties, that gap often matters more than the tuition.
Saturation after 40
Saturation is where the highest pay is, and it's the goal that makes age matter most. You can't train straight into it. You need years of logged surface-supplied work first, then a closed bell course with very few places worldwide. Our guide to how to become a saturation diver sets out the prerequisites. They typically include around 100 logged dives over 100 hours of bottom time and at least 12 months holding a 50-metre qualification. It puts a realistic timeline from zero at four to six years.
Starting at 40, that puts a first bell run somewhere between 45 and 47, if the work, the medicals and a course place all line up. That's late, but not unheard of. In a 2019 study of 51 working saturation divers, the average age was 46.1 (range 31 to 61), with an average of 21.8 years of diving behind them (Imbert et al., Frontiers in Psychology). Most of them started young. A 40-year-old beginner would be doing in five or six years what most of that group did over two decades.
How long diving careers last, and where older divers go
No official source publishes an average career length for commercial divers, and we won't invent one. The same study shows some divers are still working in saturation at 61. It also shows the average saturation diver has two decades of diving behind them.
What wears careers down is well known in the trade: the yearly medical, joints and hearing, long rotations away from home, and industry downturns. We cover the physical side in chronic injuries and a diver's working life.
Most divers move out of the water gradually, into roles where their experience counts:
| Next role | Why diving experience helps | Our guide |
|---|---|---|
| Diving supervisor | Runs the dive from the surface; logged experience is a prerequisite | From diver to supervisor |
| Life support technician (LST) | Runs the saturation system from outside the chambers | What an LST does |
| Underwater / NDT inspector | Inspection skills carry over to topside and data roles | Underwater inspector (CSWIP 3.1U) |
| ROV pilot | Knows the worksite and the task from below | From diver to ROV pilot |
Late starters should plan for this from day one. If you start at 40, the move to supervision or inspection may come only a few years after you qualify. Collect the tickets and the logbook entries that make it possible early on. The full list of options is in second careers after commercial diving.
A checklist before you commit (any age, but especially over 35)
- Book the diving medical first. The HSE medical or the ADCI physical, done by the right doctor, before any deposit.
- Test your fitness honestly. If you can't comfortably swim the school's test distance (DIT asks for 400 metres unassisted), fix that first.
- Budget the full cost, not just tuition. Include housing, travel, gear and the months without pay: DIT's own total is $48,800.
- Model two lean years. Can you cover your fixed costs on an entry-level wage near $43,000 before tax, with gaps between jobs?
- Decide your target work. Inland, inshore, offshore air or saturation. The later you start, the more the first three have to make sense on their own.
- Bring a trade. Welding, rigging, mechanics or construction experience makes older entrants more useful on day one. See what to study before commercial diving.
Coming from recreational diving? It helps with comfort in the water, but it doesn't count as a qualification. See from recreational scuba to commercial diving for what carries over.
Guides for career changers
New guides on training, medicals, costs and first jobs, written for people starting commercial diving later in life. Sent when there is something worth reading. No spam.
Frequently asked questions
What is the minimum age to become a commercial diver?
In practice, 18. UK law sets no minimum age, but the HSE says no one under 18 is accepted for offshore work. In the US, the ADCI does not issue commercial diver cards to anyone under 18, and schools such as Divers Institute of Technology and Ocean Corporation require applicants to be at least 18.
Can you become a commercial diver at 45?
Legally, yes: neither the UK regulations, OSHA nor the ADCI set a maximum age, and schools such as DIT say there is no cut-off age. In practice you must pass the diving medical every year, and the ADCI adds annual ECGs and lipid tests after 35. You will also have fewer working years to earn back training costs of up to about $48,800. Get the diving medical done before paying a deposit.
What is the average age of commercial divers?
No official statistic gives the average age of all commercial divers. For saturation divers there is study data: a 2019 study of 51 working saturation divers found an average age of 46.1, with a range of 31 to 61, and an average of 21.8 years of diving experience. It is a small sample, so treat it as an indication, not a census.
How long can you work as a commercial diver?
There is no legal retirement age. You can dive for as long as you pass the annual diving medical, including its fitness test. In the study of saturation divers above, some were still working at 61. Many divers move gradually into supervision, life support, inspection or ROV work as the medical and the physical demands get harder.
Sources
- HSE, Diving FAQs (age limits; medical validity).
- HSE, Medical examination and assessment of working divers (MA1), June 2023: para. 36 (age), paras. 52–58 and Table 1 (exercise testing).
- UK, Diving at Work Regulations 1997 (SI 1997/2776).
- OSHA, 29 CFR 1910.410 Qualifications of dive team.
- ADCI, International Consensus Standards for Commercial Diving and Underwater Operations, 6.5 edition, section 2.4 (medical guidelines), as reproduced by Ocean Corporation.
- School entry requirements: Divers Institute of Technology; Ocean Corporation; The Underwater Centre.
- Divers Institute of Technology, cost of attendance.
- US Bureau of Labor Statistics, OEWS May 2025, 49-9092 Commercial Divers, via O*NET OnLine.
- Imbert JP, Balestra C, Kiboub FZ, Loennechen Ø, Eftedal I. "Commercial Divers' Subjective Evaluation of Saturation", Frontiers in Psychology 9:2774 (2019).
Published 28 September 2026. Figures checked on 28 September 2026 against the sources above. Found an error or a newer figure? Tell us.
Photo: LouisvilleUSACE · CC BY via Openverse