[armchairhacker]

> How old did you have in mind?

Somewhere between 70 and 80

> All of my colleagues who have died in old age (at least late seventies) did so in full command of their senses, one of them still contributing to international technical committees into their eighties.

Likewise, there are 14-year-olds and 16-year-olds smarter and more mature than most adults. Loss of rights doesn't mean they can't contribute, have others deny opportunities or abuse them; people would still look out for them, they would have more protection than children in this regard. Mainly, it makes it easier and more common to control finances, prevent from driving, and prevent from rotting in front of the TV old people who have lost their senses.

[ninalanyon]

Perhaps I'm misreading you but giving up rights and losing rights are two different ideas.

I'm 70 by the way. If I want to plan for this I can set up a power of attorney.