Military age limits
UK - The British Army recruits ordinary soldiers from age 16 and the upper limit is 36. For officers, the age range is 18 to 29, but some older specialists such as medics are also recruited.
US - The armed forces recruit from age 17, and the upper limits vary: for the army it is 35, for the marines 28, for the navy and air force 39.
Israel - All citizens have to do military service on turning 18; for men it is for 32 months, for women 24 months. Then they have compulsory reserve duty (usually 36 days per year) - until age 50 for women and 55 for men.
Finland - Bordering on Russia and preparing to join Nato, Finland has conscription, giving it a reserve army of 280,000 to bolster its standing army of 25,000 if necessary.
Finnish men do military service of up to a year from age 18; women can volunteer for it. Most then remain in the reserves until 50.