My parents were (almost) 27 & 30 when they had me, and were 32 & (almost) 36 when they had my sister.
Husband's parents were 25 & 27 when they had him, and 27 & 29 when they had his brother.
As I get older, I tend to think about this more frequently. For example... if I've had a stressful week or think I'll never be ready for children, I'll think gosh, my mom had a 2 year old when she was my age.. etc, etc.

Is this something you compare yourself to or ponder?