i used to think like you, but then, if I always think I'm missing out, i will just continue to feel unhappy...
try to think from another point of view, your children will be old enough and you will still be young and have energy to play/ travel with them.
of course everyone show their best side, especially in classmate reunion events... who knows they may be very concerned about their 'age factor'?.
take my sister-in-law for example, she's in the 25-30 age group, she always want to go 'pak tor', but she has no boyfriend. so she always say things like 'oh, i enjoy being on my own... i enjoy the private times... i can spend all the money i earn... i don't need to entertain non-related people, etc etc... but from other conversations, we can tell she wants to be married and be c9!!!