I just saw an amazing post from a Kaitlin Musser on Facebook... She's hiking the PCT, and part of the way, she's accompanied by an exceptional 8-year-old kid, foster son. I see from her public FB posts that he's been hiking some of the distances with her -- she posted on 4/13:

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day 21 : 566 miles
these babe did a 31 mile day with me
soaking in these days of peace with him
and a picture of the kid.

Then on 4/19, she's posted two pics on the Mt Whitney fb page, one of him climbing the slope (chute) west of the 99 switchbacks, and one of him lying by the metal summit sign. The post doesn't give much detail about the climb, but writes:

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started at 3a
summit at 8:15a
took the chute unassisted with his own ice axe and crampons
turned 8 just 14 days ago....
...oh and he did mount Muir on the way down
Monday April 19th
Whitney Portal Trail up the chute and to Muir

Kaitlin and her son could run circles around most of us!!!