I don't care for the thought of outliving my contempories, which would be almost bound to happen if I live to 100.
To me, it depends very much on quality of life. If I am still here and still enjoying live at the age of 90, then I may very well want to live until my 100th birthday comes round.
Resuciation? If I fall in the street with a heart attack and someone manages to bring me round within the nine minutes that should leave me with no brain damage, then I will be grateful to them.
But to be brought back to a life with impaired facilities? No, thank you.