I didn't even know there was a biological clock since I had my kids at age 19 and 21.....

I always got the ohhs and awwws at seeing a newborn but I never wanted another child and when I became a grandma at age 41 I transferred all my ohhs and ahhs to him.

I believe people are hit with feelings of wanting a baby at varying ages....no clock ticking just a sense of wanting to either have a child or not. It is more a decision making time imo.