I sent this article out to my daughter Ann in Oklahoma, who is quite active in backpacking in the wilderness. Here's her reply:
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I just got home from outings leader training. Most were 30-35. Sierra club requires outings leaders to go through training, first aid and wilderness first aid and lead a provisional hike with another leader before you can actually lead a hike. In our beginner backpack class we normally have as many young folks as older. Not too many with young kids but lots just out of college or parents of older kids.
When Katherine and I did coyote gulch in UT Most of the folks we saw looked in their mid 20's. (Go Google Coyote Gulch - beautiful and watch the video going through crack in the wall. That is the hike we did. Oh yeah, the video is a young couple and their young child).
I hike in AR CO UT & NM and see mostly mid 20-30's. When we were camped last year near the trail to the peak in the Never Summer Range the stream of folks going to the summit were teens or 20's though there was a group in their 70's & 80's.
I think this guy mistyped; he writes. He doesn't Hike.