Met at 28. Married at 31.
This was ideal for me. Dated plenty, traveled solo and with friends, built strong friendships I have to this day, focused on school/career, and had an all around awesome life. When I met my DH, I wasn’t at all looking to have a serious boyfriend. But he was so great, that I gave in and married him.
However old you are, I think it’s important to come from a place of strength and confidence in who you are without a partner when you meet the person you marry. That comes at different points for everyone.