Living forever (being immortal) would be a real drag.
Because that would make you totally uncaring about today.
What would you consider to be precious?
I think you'd lose all emotions for your fellow creatures.

Plus the poll *didn't* say "in perfect health" it just said how long - which affects how rapidly you age.
Who the heck wants 500 years of ED, or for you women 500 years of hot flashes <grin>?!?