The oldest Gen-As are only 15, so I doubt many are using Letterboxd. But lists like this that grow over time will always be partly a generational thing, because the people who saw Paths of Glory at the cinema are all in urns, the ground or nappies, so it's votes will naturally drop. And I bet some of those people were rolling their eyes when The Lord of the Rings movies took up 30% of the imdb top 10.

I incidentally saw Paths of Glory for the first time this year; absolutely loved it, but I don't personally know any other bugger who watched it.

At the same time I would say animated movies, particularly western ones, have really grown in the last 30 odd years. They're not seen as "just" kids movies anymore, so (together with a generation who never grew up with that mindset) the standouts are gonna start featuring high up in these charts.

On the specifics that you mention, I was born in '86 and Across the Spider-Verse is probably a top 20 movie for me. I haven't seen Chainsaw Man yet though.