Baby boom around me?!

Seems that everyone around me is getting pregnant: my close friend from PU time is going be a new mom next week, another two friends from NJ board are going to have "dog tails", and I just learned 5 minutes ago that one of my "lunchmate" is 2-month pregnant. Is that because these two years are the best years to have baby, or just because we are getting old? Maybe both. I guess I have to set another goal for myself too, :)