I’m in my mid-70s. I spoke to my uncle when I was 9 or 10. He was over 100 at the time and died the following year.
If I remember correctly, by uncle was about 13 when he enlisted in the Confederate Army in the last year of the war. He was born in 1852, so he would have been 104 when I met him.
Your dad must have either come from a VERY large family or was REALLY old when you were born. The last surviving confederate veteran was born in 1847.