Some kids just like hiking and a few can out hike most of us here and still have energy left at the end of the day..

The youngest to complete the Triple Crown is 13 years old.
http://www.backpackinglight.com/cgi-bin/...thread_id=81447

The youngest to Complete the PCT was 9 year old.
http://www.pcta.org/2012/nine-year-old-monkey-completes-the-pct-575/

Better to have them out doing something then sitting around texting all day..