Did Jesse James fight in the civil war?

Answer 1

Jesse James rode with Quantrill's Raiders, a paramilitary guerilla group of Confederate sympathizers who pillaged and killed along the Kansas and Missouri border towns. After learning his trade with Quantrill, he and his brother along with their cousins continued in this occupation after the war. They specialized in banks and trains.

Answer 2

He was 35 years old when he died in 1882, so he was in his 20's since the civil war was 1861-1864. That was about the average age for a civil war soldier.