my gran (on the other side of the family) was very vocal and had a DNR on her bed after having a couple of strokes but surviving them. she had another one, a massive one, and for what ever reason the doctor ignored the DNR and brought her back after she crashed.
she had a further 3 years or so in a home, in a nappy with the mentality of a 2 year old.......... what the doctor was thinking i do not know and to be honest had my dad not been in such a mess over it all, i would have been tempted to suggest he look into making a formal complaint, but i decided he was struggling enough as it was without pulling at that thread.
My dad is 78 now and looks more frail every time i see him, my mum a bit younger but has COPD and i suspect will need an oxygen tank soon. not directly relevant to this thread (as i am not suggesting euthanising them)
but getting old sucks (but generally for the most part is better than the alternative)