[NathanR]

Uhh, 30 is well within the "shelf life", it starts to expire in the late 30's, not the early 30's.

If you marry at 30, and your child marries at 30, you will have grandchildren in your 60's. Later, the decades begin to add up quickly.

[Melas]

I'm failing to see the significance of the grandparent thing. My parents were both in their 40's when I was born. The lack of grandparents in my life hasn't had much of an effect on me either way.