Mum must have been 20 when she had my brother and 22 when she had me. My dad died when I was 4, so by my age she was a widower with 2 young kids. Scary!
She's an amazing woman though and pretty much put her life on hold to raise us, and once I finished high school (when she was 38ish), she picked up right where she left off, and went out clubbing with her friends, put herself on internet dating sites and has done a heap of travel since.
DH's parents are almost as old as my grandparents, and there is a huge generation gap between them, so we always said we'd have kids as soon as we were ready - we want to be healthy enough to able to have fun with our kids through their whole life and be in touch with what they're going through.