I would love it! But as he's never done anything like that in his life...I'd be concerned!
Not sure about other 'old' people here, but my dad is of the mentality / generation / background of WORK, WORK, WORK, and nothing to do...more WORK! He can't retire, and won't retire as then he'd probably die.
He asked me about buying a bike and riding with me, but I quashed that idea very fast as he hasn't ridden a bike in 50 years, reflexes are slow, and I can't support this idea as I'd feel guilty should something happen. So instead we build stuff around the house, and wood storage sheds at the cottage.
UPDATE: Shed finished, wood put in, and the entire 70-80ft tree fit in there...with some room to spare.