I do not know which soldiers the question refers to. The simple fact is that young men between the ages of, say 16 to 30 are, and always have been, very good at fighting each other.
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Kids to old men.
Headqear is a military term for "hat" or a helmet.
Most of the soldiers in the Civil War were 18 to 35 years. Some soldiers as young as 12 and 13 participated in the war. Men as old as about 45 were welcomed into the Army. Many of the generals and colonels were much older. Robert E Lee was 58 at the end of the war. General Winfield Scott was 75 years old when he resigned early in the Civil War.
The average age of southern soldiers is not known but ir would have changes as the war progressed as both very young boys and old men were pressed into service. For union troops it was 25.8 years old.
17 to 39 with 26 the average age