I get the impression that he'd be happier dying "in harness" next to HRH than quietly in some bedroom (unless with a bevy of starlets).
I wouldn't be surprised though if in the background efforts are made to make his appearances as comfortable as possible. Not quite a Popemobile but some shortening of length of appearances, and any other aids so he can continue with dignity, even if whisked away after 5 minutes or so.
Some days I feel like ****e, and I'm almost 2 generations younger!
Personally I'm proud that he has been so stalwart (as has Ma'am) reliable and dependable. Don't let the cameras zoom in or for too long, please, we don't want frailty exposed in anyone.