I'm Gen-X and oh my god you have no idea.
My dad was pre-Boomer (born in 1931), but he just endlessly collected stuff. Thousands of movie soundtracks and classical music albums on both LP and CD. Hundreds of DVDs. Mountains of movie memorabilia and posters. Coins. Stamps. Rare books. Antiques. That's just the major collections. Lots of minor ones- sheet music, British cigarette trading cards, and then there are not just the over 20 books he wrote, but extra copies of them. Most of them are academic texts on film. The rest is stuff like terrible poetry and bad plays that no one is interested in but I can't bring myself to get rid of.
Much of it had value, so I didn't want to just dump it. We did an auction for some of it, garage sales, a flea market stall, I ended up spending about two years selling stuff on eBay, I gave a lot to friends, the CDs eventually just had to go to Goodwill because no one wanted them.
And I'm still stuck with a ton of stuff. A garage full of stuff that I don't want to just toss because someday someone might want an almost life-size ceramic bust of Charlie Chaplin and it feels stupid to just throw it away.
Meanwhile, my also pre-boomer mom (born 1942) has been collecting antique furniture.
I think I'm just going to do an estate sale when she dies.
I have one "collection." 5 bakelite radios and one Weltron Space Ball radio/8-track player. My daughter has my permission to take them to some charity place if she doesn't want them. Preferably not Goodwill or the Salvation Army, but those are the choices you get in this town unfortunately. Nothing else I have is of any real value and I'm fine with that. And having seen what I've already gone through to get rid of all of this stuff, my daughter is too.
Edit: I forgot to say that the stuff I talked about doesn't include all the stuff I said to my brother "just take what you want" about because I really didn't want to argue about it and he was going to fuck off back to Atlanta after the funeral anyway. But he doesn't have any kids and he's 11 years older than me, so I'll probably get all that shit too one day.