Not really a surprising result for a study, but it's good that there's actually some solid data to back this up now. Of course, common sense would dictate that if you were a kid, and had a relatively simple, good life, you would automatically highlight that as "the best years." Subjectively they were. But once you let that actually influence your political decisions, that's where it all starts getting problematic. We're seeing that now with the Baby Boomer generation that is still digging its claws in with what's left of its authority just before the push comes and it's Generation X's turn to take over, although they largely already have.
I guess it also depends on how much media you have left available to you. Future generations, like the Millennials, will have unprecedented access not just to the general past, but their own. I'm Gen X, and have largely missed the wave of social media. Hell, I STILL don't have a Facebook account. But future generations will have never known a time when they didn't have a digital footprint, first as photos as babies on their own parents' social media accounts, and then their own once they got into Twitter/Snapchat/Instagram. All the ugliness, the anonymous hate speech, the stuff that used to just go on in whispers in bars and schools is actually documented now as doxxing, hate speech, digital bullying/sexual harassment, and other things.
I don't actually know if future generations will have as easy a time saying "Yeah, it was so much better back then," when they call up timelines from their own teenage years with cyberbullies gleefully asking them to kill themselves, or documented Tweets from people caught up in mass shootings, or protest suppression by the police.
