I was 38, and I'm now a 71 year old great-granny to 2 girls, age 3 and 1.
I had my daughter at 16, she had my grandson at 22 and he was 29 when his partner had the first of their 2 daughters.
I know I started very young, but it does concern me how late women are now leaving it before having children. It's one thing having a first baby in your 40s, quite another having a couple of stroppy teenagers in your 60s, even more so if you are trying to juggle caring for elderly parents as well.
I have all the enjoyment of my great-grand-daughters with none of the responsibility. Their grandmother (my 55 year old daughter) and the other grandparents do the hard work helping out whilst I look on!