I think there's a certain grey area between when you think you should be an adult and when you start feeling comfortable acting as you think adults do. Over the last five years, every year I've cleaned out a bit of my old sentimental stuff, but there are a lot of things I'm not ready to toss yet. I keep them in boxes or bins, out of sight but I know where they are if ever I want to peruse them. Maybe I'll keep it all forever; maybe most of it will end up in the trash over the net ten years. The main thing I'm finding, as I grow up, is that mentally, emotionally, it's a very gradual process.