I'm not sure that comparing notes on our ages is necessarily an attack. I'm the first to admit that I'm an old coot whose attitudes have surely been shaped by growing up in the sixties--and watching classic old scifi and monster movies on tv.
We all have our own formative influences, depending on when we were born. For example, I got exposed to
Dark Shadows at an impressionable age (thank you, Aunt Margaret) and have been obsessed with vampires ever since . . . .
Was there some halcyon TNG era after the Cold War? Possibly, but, from my perspective, that was just a temporary blip. Pre-STAR WARS, sf was, arguably, bleaker and more pessimistic than most of today's big summer blockbusters are ever allowed to get. Downbeat, despairing endings were the norm--which would probably never get past test audiences today.
I mean, look at the original PLANET OF THE APES movies, which were probably the biggest scifi franchise prior to STAR WARS and the return of TREK. Every one of those movies ends on a bitter note--the closest thing to a happy ending is in the fourth movie, when the apes rise up to enslave mankind!
And then there were the Road Warrior movies, Escape from New York, etc.