Were they as able bodied as they were aged 20-25 though? If 80 years is the cutoff at which we get bored with staying alive, would you rather spend those 80 yea

Were they as able bodied as they were aged 20-25 though? If 80 years is the cutoff at which we get bored with staying alive, would you rather spend those 80 years in a "biologically" 20-year-old body then make the conscious choice for "something new" or gradually deteriorate for about half of those 80 years then die without the choice not to?