To be happy. Do whatever makes you feel that way. I have a number of female friends around our age who seem to have difficulty grasping the idea that life doesn't end at 30. Don't bend to societal pressure that women have to do certain things and be a certain way. Just relaxed and do whatever makes you happy.
That you still have your looks
you can breed easily.
many expectations are possible.. depends on whose expectations do you mean? your own, your parents, boss, professors, friends, siblings, boyfriend, girlfriend, government, etc, etc..? your question is a bit too vague to answer...
Have a stable job and have own family