I'm reading this right now (in my 30's) and LOVING it! It's a hefty read, but the story--though I've heard the story before, seen movies, etc.--is so great it's fantastic.
I'm 31, so I'm about the same age .. I've heard of the book before, but didn't know much about it, and haven't read it until this year. It truly blew me away, almost from first page. It will be one of the very few books that I re-read.