"From someone who has (hopefully) only lived about a quarter of their life"

Do other people feel the same way? Obviously future medical advances might change my mind on this, but I would prefer to die around 80...

I know the cliche is "you feel that now when you're young, you wait until you're my age and say that again"... but I suspect that when I do reach that age, my main reason for not euthanizing myself would be not wanting to upset people who know me, rather than because I actually want to live to be 100 years old.