I received my undergrad degree at 29. Didn’t even start until I was 24. Graduate school wasn’t until I was well into my 30s, and for my field anyway, that was the average age of my fellow grad students. Some were in their 40s and 50s. My fellow grad students who WERE in their 20s were looked at largely as rather inexperienced children to be tolerated but not taken TOO seriously.
Grad school was where I met my Thai wife, and she was in her 30, too. It was her first time to live abroad.
So believe me, Ninja Chick, life does not end at 25, or even 30. 