We have a fragmentary record of a Mesopotamian war between the city-states of Umma and Lagash about 2,700 BCE. No doubt there were plenty of wars before then, but not specifically recorded.
Revolutionary War
110 year old is the oldest soldier during world war 1
The oldest age to join the army was 40.
The Ones In World War 1
Clayton
See if the "American War Library" can help you out.
well my dad went in war at the age of 72
There wasn't really a limit to enlist, but the oldest people were around 45.
52
89 and up
18 years.
The oldest veteran of World War II is currently Richard Overton. He is living in America at the age of 107 years old.