To enlist in the Canadian Army during World War I, individuals were generally required to be between the ages of 18 and 45 and in good physical condition. They needed to pass a medical examination that assessed their overall health, including vision, hearing, and the absence of significant medical conditions. Recruits were also expected to meet certain height and weight standards to ensure they were fit for military service.
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World War 2
Yes, many did.
You had to be 18 to enlist for the British Army in World war II, though some boys who were younger were able to enlist using false documentation.
Not in the army, but as a nurse.
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I believe there was was a Frenchman, aged 84
1914
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35 years old
You just signed up at a recruitment office.
you would have had to enlist, and also have no physical or health problems that could effect you in war. also when the conscription crisis came... all the males from like age 17-65 ish were forced to go to war (in canada)