I defended my master's thesis the day before I turned 30. "Funny" story is that I always wanted to be an MD, like my grandfather. My mom was 100% hands-off with us about our education, but the one thing she said to me was basically, "Why do you want to do THAT? By the time you finish undergrad and med school and internship and all, you'll be 30 before you are out of school!" Happened anyway, in a field I don't love with a degree I've hardly used.