Other contributors have said "How old is a grandpa who was in warwar1?" is the same question as "How old is a grandpa who was in world war 1?" If you believe that these are not asking the same thing and should be answered differently, click here
If Grandpa fought in WWI he must have been at least 16 years old to go into the army. So If he went to fight in the last year of the war, in 2008 he must be at least 106 years old.
The minimum age was 18 but since the technology was not advanced enough to check social security you could lie about your age so there really was no age requirement its just common sense on look i am...
the age limits in WW1 varied by country. the United States, for example, required a man to be at least twenty-one to fight, where as in most European nations, countries were so desparate for men that...