I have seen some folks like that on my rafting trips- they are great. Some are in their 70s and still storming castles !!
Yep. My friend the "hiker" is the youngest of the bunch he hangs around with.
He told me of a night spent on the side of a cliff about 2/3 the way up a
mountain. 3 of them were camped on a 2 foot wide by 20 ft long ledge for
the night.
He was the youngest of the bunch and the other two were in their 70's.
Impressive