Aw, I feel your pain.
We let our kids live here and make something of themselves {that is our hope}. I do think of their rooms, now and again, and what I would love to do with them.
In this day of extremely high rents, to me, it is sort of a waste to spend so much money. We all do get along quite well, I
try to stay up on them about the money I charge them {we do charge them a bit, just so they feel something}.
At one point, a few years back, the chickie talked to me about her wanting to move out and if we could save her room for her. I laughed. I said 'What, you mean my office?'
But I did tell her that it would be okay.
I agree about not saving the stuff in his room. Hello? That is a big responsibility thing there, saving your own crap. It is easy to box things up and leave it with mom. If you have to carry it around, you are a lot more selective. Thinking {as I type, what a novel idea...} about it, maybe storing some of his more precious things may be a good idea....you never know how other room mates may be....
And, yes, RStar, sometimes a big house is an invitation for 'guests'. But, the lady two houses over also has a big 5 bedroom house and amazingly, no kids have moved back home and she doesn't rent out any rooms. I am amazed at that. Considering I myself have had to move back with Mom twice.....
I digress....
Get a nice hot cup o'joe and look at some photo albums and enjoy going over the life you've had so far with your son and know that there is so much more to come.