I had some from the 80s and 90s. I kept better track of the t-shirts than I did the ticket stubs, I suppose.
Honestly, in the back of my mind, I was saving my t-shirts for my kids anyway and it makes me happy that my daughter loves them so much. She's always been big on graphic tees anyway, but nothing new can be nearly as cool as an original from the event itself.
My kids have also stolen a couple of my old leather jackets that I saved for similar reasons. Their styling is too youthful to really suit me anymore but I couldn't let go of them, and am delighted they now have new life.