Recently turned 29, and bought my first MH a couple months ago. No plans to stop RV'ing any time soon. The MH is a supplement to my real hobby though, car racing.
I'm not sure why I didn't buy a RV about 4 years ago.
Aside from having the space to park it, I don't understand why everyone doesn't own a RV of some sort. I travel a lot for racing, and plan to camp at the race tracks. During the holidays, it tends to be a little cramped at the parents' house and in-laws house, so I plan to camp in the yards of family during visits. Might even do some more traditional camping with the wife as time allows. There are just so many uses, and so many great deals on older (and still reliable) RV's.