I'm the oldest of 4, my mom was 23 when I was born. My dad had just turned 28. My mom became a grandma in her early 50s. I realize if the trend continues and my DD has a baby the same age I did, I'll be a grandma at 60.

I think our parents generation is probably one of the last generations that will see many 1st time grandparents under the age of 60.