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>?!?