I have stuff from 1979, 1980 in my collection. But I also have things from 2012. So I don't know if it's memorabilia as much as it is holding on to things that I find relevant that most people might not.
Why do we feel jealousy? Therapists often regard the demon as a scar of childhood trauma or a symptom of a psychological problem. And it's true that people who feel inadequate, insecure, or overly dependent tend to be more jealous than others.