With regard to the actual poll, of course young people are going to be more accepting: they're young. Their ideals won't have started to get knocked about and worn down and they won't have had time to develop the emotional intelligence that comes with experience.

Also, many of them might still be covered under their parents’ health insurance (up until age 26 in the US). And even for the somewhat older ones, being young and mostly healthy may have had little interaction with their insurance providers and few if any claim denials.