Paul: Good point on younger folks still having a life outside of hiking. (work, school, dating, concerts). Whereas the retirees and idle-rich can hit the trail for longer and more often. Also, older folks have learned to condition beforehand (if not, they've had to give up longer trips).
Boulder? Ever hang with Boulder CHAOS (Colorado Hiking And Outdoor Society)? The founders (Coy/Don Christensen/Chanders, Marty Isaacson, Thomas Doerr) were ex-Berkeley CHAOS people who were all on the gourmet backpacking trip that I met my wife on.

