i'd honestly consider trying to get myself MAIDed if i ever failed a senility test or similar. i can't think of anything worse than being permanently subjected to the array of petty cruelties and condescensions that are reserved for the elderly, children, those with cognitive disabilities, etc.
children, at least, emerge from it. you will only ever sink deeper. you will have brief moments of clarity where everything around you seems intolerable and vile, and you will be encouraged to have a nap and sleep it off. they might even drug you. when you wake up, everything will still be vile, but you won't be able to articulate why. your loved ones, if extant, will avoid you. if at home, you will seem to have brought a curse into their midst, and if in an institution, whenever they visit they will encase you in a layer of shame and embarrassment that will prevent whatever communication was still possible. the rest of your time will be spent surrounded by other outcasts and your sullen, resentful caretakers.
the archaic torso of apollo, is that you? what was it you said to me, all those years ago?
no second childhood for me, thanks.