My ex-wife used to moan when I went out biking, but she didn't have any hobbies of her own so never understood why I enjoyed getting out on the bike so much. The current girlfriend is a horse rider, and takes every opportunity to get out riding, so she fully understands where I'm coming from, she has no problem with me heading off for a weekend biking, this one is definately a keeper!
I'm a few years younger than you (31) but based on my personal experience I would say don't grow up! If you feel that you've been forced to give up a hobby you enjoy, you will only grow to resent her, which will not lead to a healthy future for you.

