I grew up in Maine...and to me, camping was what I had to do in the backyard when my grandparents came to visit one week every summer and took over my bedroom (the tent I stayed in was 6 ft tall at the center). And, uh, that was it for my outdoors experience, for a long time.
Right after I graduated from college, I met a boy. This boy took me hiking, and I kinda liked it. And then, I decided that a bike ride around the Quabbin might make a nice loop (I thought I was going to die, after). And then, the boy introduced me to some of his friends who also liked to do outdoorsy things.
Things didn't work out with me and the boy, but since then (among many other things) I've hiked the 48 4Ks, done trail work in Idaho & Alaska, ridden my bicycle across the country, and whitewater kayaked on the Ottawa River...and my next project is to hike the AT next year.
I've decided that I will never have children - for myriad reasons, not the least of which is that I don't want to give up my lifestyle. Even though not having children isn't exactly "retiring" - it's a life decision which allows me to continue fueling my addiction.
BTW I just turned 29. And I have no intention of slowing down!