The average age of becoming a grandparent in the United States is 47. I was a couple of years younger when I became a grandparent, but not as young as Rifca Stanescu, who last year revealed that she had become a grandmother at the age of 23. She was 12 when she gave birth to daughter Maria, who gave birth at 11. Stanescu states that early marriage and reproduction is a part of the her Romani culture. On this side of the Atlantic, our interest in teen moms and family drama has supposedly spawned a reality show featuring grandmothers in their 30s, now in development.
If reading about very young grandparents is a turn-off, maybe you'd like to hear about some old grandchildren. I was amazed to read that two of John Tyler's grandchildren are still alive. That's President John Tyler, who served from 1841-45. His grandsons are in their 80s. Reproduction at a late age is responsible for their unusual status. The most prolific of our Presidents, Tyler had 15 children. Number 13 was Lyon Gardiner Tyler, born when Tyler was 63. Lyon was still having children in his 70s, making it possible for a pre-Civil War President to have surviving grandchildren.