My oldest was told- you need to leave home before age 30. She moved out at 29 1/2. Her room turned into a guest room where I sewed. Had to pack up everytime someone came over.
Then my oldest son moved out- sort of. He came, he went, he came, he went, and finally he was gone. Don't know when I actually thought he was really gone, but it was months later. He kept his room the same. But then I was collecting more "stuff."
DD came and left several times too. Her room was in the basement because she left one too many times and other DD claimed her room and wasn't moving back out to accomodate. So we put a room in the basement.
We were facing 3 "guest" rooms. So- basement bedroom turned into storage- although it's a real nice looking storage room! Took DS's bed down into storage and started moving into his room. He didn't like it.
I am slowly moving him out- I still see his certifications on the shelf and I just moved over the bowling and wrestling trophies to put a basket on the top of the desk. Now if I could just convince him that when he's done with a semester's classes- they don't need to come here- we share the book case still. He has 2 drawers of his dresser with clothes and some in the closet. He says they are there in case he gets stuck here in the snow. OK- how can I argue with that?
But slowly but surely it looks more like a sewing room. I've talked them into cleaning the basement too. Time to get rid of the Boy Scout stuff and toys, etc. Now that is very hard to let go. I even rescued a few things- my younger DD's Glo Baby, DS's spongebob pillow to name 2. Goal is by spring to get rid of 50% of every room. (that is except my quilting stuff)