Don't worry, all these people moralising on the importance of aging and dying will do their utmost to live longer and in better health whenever the time of the choice comes. No one will say "oh well I guess I'll just keep this illness because that's the natural course of things"- they will get the medicines and the surgery, the creams and the lotions, they'll jog and limit exposure to the sun and avoid smoking and drinking. Given the choice, unless incurably ill or in the depth of despair, they'll always choose life. At least for themselves.