how old, specifically, are the characters in 'the big chill' meant to be ?

the characters pick on Tom Berenge's J.T. Lancer not realizing they're talking like a sitcom

otm

http://www.criterion.com/current/posts/3250-the-big-chill-these-are-your-parents

I scanned this essay. It was bad. Unreadably bad. Then I scrolled to the bottom and the byline read: Lena Dunham. And that's... the rest of the story.

i've still never seen The Return of the Secaucus 7.

Every thirty-something character from '80s filmed entertainment still looks to me like they're at least a decade older. Excessive smoking and bad perms will have that effect.