Such lovely memories!
I’m in the extreme minority here, see no problem keeping nostalgic things around, either filed away with other memory bits or out in places that you brush up against them and smile occasionally, for as long as they bring you a smile. Clearly labeled, perhaps with a note in a pocket, in either case. But whether that’s a good idea or not is really for your kids to say, I suppose.
Ps. This post reminds me of CindySmith’s blog. I wonder what/how she’s doing now.