re: Any astrophysicists or astrospace engineers here?

I'm an aerospace engineer. One of my classmates in college did just what you are thinking about. He was a few years older than the rest of us but he was more focused and didn't fool around going to bars and parties. After graduation he ended up going to Navy flight school...he just barely made the age cutoff.

I'd say go for it if you're really interested in those fields. It's not too late.