You're assuming he actually knows what he's doing ... he probably doesn't even know where he is
I'm joking but getting old and being old sucks ... I'm on my way there and all I can see and all I ever heard about it from my elderly friends is that it is a world of constant pain, aches and frustrations .... your memory goes, you can't remember basic things (but you can remember a phone number from 1988), your joints ache all the time, your muscles ache all the time, your back is pain, you have a hard time walking, you have a hard time sitting, you have a hard time lying down, you have a hard time standing, you can't hear well, you have weird things happen with your vision, you can't hold, grasp or handle things like you used to
I'm not there yet but after having just reached 50, I'm starting to feel everything ... and feel everything all the time ... even typing this I'm reminded of a constant dull pain with my arthritic pinky finger.
And age also assumes that you'll be able to keep a healthy functioning mind. I can tell my memory is slowly evaporating with age.