Ok! I am 72 and when I was about 10 or 11 I went to a Fourth of July parade with my parents and I distinctly recall my Dad pointing out veterans of the Civil War passing by in a bunting-draped convertable as the band played "The Battle Hymn of the Republic."
Remember in that war, soldiers were sometimes as young as 12-years-old (drummer boys particularly.)
You do the math, my brain's all squiffy.