For a man.
It depends on what you want in life and your plans. But I also think that you dont need to wait until you are in 30s if you have a right candidate and a decent job. The earlier you assume family responsibilities the better you become a disciplined person and frugal in financial decisions. You are likely to become more successful than your peers who are single. You will be able to support your children while you are energetic rather than waiting the rush hours/minutes.
For a woman.
Your decision to get married depends mostly on mans readiness. You might be ready to start a family but the man is not in position to start taking family responsibilities and years continue to pass by
which makes you look worried as the age goes
.