The real scary thing about aging is the possibility of being abused towards the end of life if you've no one to look in on you. Even in the best nursing home, even with a child's diligent oversight, you can still be abused.
We required a nursing home for the end of mom's life because of Alzheimer's. My brother and I discussed placing cameras even in the bathroom but then you have to weigh the odds of getting abused against how my mother would feel about me watching her in the bathroom.
Sometimes you just have to trust the world.
I've got a pack, only half jokingly, with my childless family members and friends--though I've one cousin who very seriously wants us to do this--that we end up life together either stateside or overseas, pool our resources, bring in some help and look out for each other in our declining years. But no matter how large your family, eventually there's just one left, blessed with longevity, who could then be at risk for abuse.
So we're gonna leave a bottle of cyanide for the sole survivor.