When I was 38, in the hospital with a new baby, my roommate was 19 and her mother, the grandmother, was 38!! It can easily be done. I thot I maybe belonged in the geriatric-maternity ward.
One of my HS friends was 15 and her mom was 28.
Hillbillies.
It’s a thing.
:)
In the late 60s I dated a 29 YO grandmother. She said she got pregnant just before she turned 13 and her daughter did the same. She was a grandmother at 26 YO.