I did not know him but I did know both my great-grandmother and my grandmother. She was still receiving a civil war pension when she died in 1962 (at the age of 97).
This was not in the south but in the northern state of Pennsylvania. They were strict Methodists.
No one thought it was "creepy" and my grandmother would be 131 years old now.
I had a grandmother who graduated high school at 16 and married. I know it used to be the norm. Her husband was maybe a year older though.