You can join the British Army as a soldier from 16 years old or as an officer from 18. If you join as a soldier under 17 years and 6 months, you’ll enter as a Junior Soldier and train at the Army Foundation College before progressing into the regular Army. From 17 years and 6 months, you join through Standard Entry. Upper limits also apply and vary by role.
Army age limits at a glance
| Role | Minimum age | Upper age limit | Notes |
| Regular soldier | 16 for Junior Entry, 17yrs 6 mths for Standard Entry. | Enlist before 36th birthday | Under 17yrs 6 mths join as Junior Soldier. Under 18 needs parental consent |
| Regular officer | 18 | 29 (30+ only by exception) | Higher limits for specialist roles |
| Army Reservist (soldier) | 17yrs 9 mths (when applying) | Apply by 42yrs 6mths. Must join by 43rd birthday | Higher limits for some specialist roles |
| Army Reservist (Officer) | 17yrs 9 mths (when applying) | Apply by 48 yrs and 9 mths | Higher limits for some specialist roles |
| Army Cadets | 12 | 18 | Not enlistment. |
What age can you be to join the Army as a soldier?
You can join the Army as a soldier from age 16. The application process can begin at 15 years and 7 months, but access to the assessment centre isn’t allowed until you are 15 years and 9 months.
For those aged under 17 years and 6 months, you attend Army Foundation College in Harrogate as a Junior Soldier before starting Standard Entry training. All applicants under 18 must have parental consent.
Older applicants must be enlisted before their 36th birthday.
What age can you join the Army as an officer?
To join the Army as an officer, you’ll need to be aged between 18 and 29, although higher limits do exist for specialist roles such as doctors. Those aged over 30 can still join, but this is an exception, and applicants are assessed on a case-by-case basis. By calling 0345 600 8080, you can discuss your options and learn whether a route into the Army will work for you.
Any scholarship applicants must be under 18 on 1 August in the year the award was granted.
What are the age limits to join the Army reserves in Britain?
Age limits for the Army Reserve depend on whether you plan to join as a soldier or as an officer.
Reservist soldier
To join as a reservist soldier, you must be at least 17 years and 9 months old when you apply. You can join most roles until you are 42 years and 6 months old, but must have joined by the 43rd birthday regardless. Rolefinder covers specific roles in more detail and explains the age limits to provide further clarification.
Some roles may have higher age limits, but you should always check in advance.
Reservist officer
To join the Army Reserve as an Officer, you must be at least 17 years and 9 months old when you apply. Applications remain open until you are 48 years and 9 months old, after which opportunities become more limited. That said, some specialist roles do have higher age limits.
What are the age limits for specialist roles in the Army?
Age limits for specialist roles in the Army vary by specialism. For some positions, the age limit can be as high as 55, whereas other roles may stipulate that 36 years and 11 months is the maximum.
Specialist roles in the Army are where the applicant has a specific skill they are already qualified in for the Army rather than starting their Army career from scratch. These could be dentists, doctors, legal officers or pharmacists, for example.
Because these are specialisms the Army needs, the upper age limit tends to be more generous, but age limits are role-specific and can be changed. Therefore, older applicants with specialist skills should always check by calling 0345 600 8080 before applying. This will help answer any questions.
What is the oldest age you can join the Army?
The oldest age you can join the Army depends on whether you plan to join as a soldier, officer or reservist.
- Regular soldier: No older than 36 years of age
- Regular officer: 29 years of age (exceptions may apply for some 30+, assessed on a case-by-case basis)
- Reserve soldier: No older than 43 years of age
- Reserve officer: No older than 48 years and 9 months
What is the Armed Forces Foundation Scheme?
The Armed Forces Foundation Scheme allows those aged at least 18 to join the Army as a soldier for 18 months and get a feel for whether life in the Army is for them. It covers selected soldier roles, such as infantry, Royal Artillery, Royal Logistic Corps and more.
A salary (£25,018.44 as of September 2026) is provided, and successful applicants get all the benefits of serving in the Army, such as subsidised accommodation, free gym use, healthcare, opportunities for overseas travel and more.
Applicants will need to be at least 18 at the start of Army basic training, meet medical and fitness requirements and fulfil entry criteria for the role you are applying for. After the scheme ends, you can either choose to stay in the Army or leave with skills and experience behind you.
For those aged under 18, Junior Soldier Training is available at the Army Foundation College in Harrogate, where, along with soldiering skills, maths, English and other subjects are also taught.
Are age limits in the Army the same as in the RAF and Royal Navy?
No, age limits are not the same across the Army, RAF and Royal Navy. This means that if one avenue appears closed, you may have other opportunities elsewhere you can pursue.
| Service | Minimum age | Upper age | Notes |
| British Army | 16 (soldier) 18 (officer) | Soldier: Before 36th birthday Officer: 29 | Applications from 15 yrs and 7 mths |
| Royal Navy | 16 | 39, depending on role | Applications from 15 yrs 9 mths. Must be 16 on day of entry to basic training |
| Royal Air Force | 16 | 54, depending on role | Applications can start at 15; must be 16 to join. Pilots must begin training before 24 |
The Royal Navy has an upper age limit of 39, but it does vary by role. The RAF is by far the most generous with age limits and has the widest window of the three, with entry starting at 16 and extending to 54 years of age.
What if you aren’t old enough to join the Army yet?
If you aren’t old enough to be a Junior or Regular Soldier, you can still join the Army Cadets to learn more about the potential career path you may want to take. This option is open to those aged 12-18 and teaches survival skills and weapons handling, among plenty of other interactive activities. There are currently more than 1,700 detachments across the country, meaning they can be found in most towns and cities.
Ready to start your Army career?
Once you have joined the Army, protecting your kit, your SLA and your possessions matters. Get in touch with Trinity to find out how we support those at the beginning of their Army career. At Trinity, we’ve spent more than 25 years providing specialist insurance for armed forces members and veterans. From life insurance to military kit insurance, we’ve got you covered. Book a call with our team to learn more.
What age can you join the Army: FAQs
What is the youngest age you can join the Army?
The youngest age you can join the British Army is 16 as a Junior Soldier. You can begin the application process from 15 years and 7 months and attend the assessment centre from 15 years and 9 months. Anyone under 18 needs parental consent.
Can you join the Army at 16?
Yes. 16 is the minimum age to join as a soldier. If you are under 17 years and 6 months, you’ll join as a Junior Soldier at the Army Foundation College in Harrogate before moving into Standard Entry training.
Can you join the Army at 17?
Yes. At 17, you can join as a soldier. If you are under 17 years and 6 months, you’ll start as a Junior Soldier. Above that age, you go straight into Standard Entry training. You’ll still need parental consent until you are 18. Officer entry begins at 18.
Can you join the Army at 30?
Yes. In many cases, you can still join the Army at age 30. You must enlist before your 36th birthday. Standard officer entry closes at 29, but those aged over 30 are considered on a case-by-case basis.
Can you join the Army at 40?
Not as a regular soldier or officer, but other routes are available. You can still join the Army Reserve as a soldier until you are 42 years and 6 months. Reserve officer roles are available until you are 48 years and 9 months. Some specialist roles, such as doctors and dentists, have higher age limits.