I have no wish to breed servants for my old age. Also, a person can't force their children to take care of them and give them money anyway, so it's not even a dependable servant breeding scheme.
Some people want children. Some people don't. Why is either wrong?
If I get into such a state, I hope I'll be able to kill myself in a reasonable way. Time to draw a line and say "Yeah, I've finished with that. Time to go." I'd prefer to live to ~90 in fine fettle and drop dead very suddenly, but if not I'd like at least the same consideration we'd give to a suffering animal with no hope of recovery. My will is clear and simple, but that's to make things easier for any surviving relatives, if there are any. I won't care what happens to what used to be my stuff, on account of being dead at the time.