Quoted from Yoko2una:

There are tons of themes that can cross the boundaries of multiple generations without being an "old man's" 60's theme pin. Those should be the focus if companies want to lure in the next generation.
1) Phineas and Ferb - My son loved that show, and I'd argue that I enjoyed watching it even more. I know many parents in their 30s that share the same sentiment. There's a Doofenshmirtz figure under my monitor at work as I write this. That show was borderline perfect and lends itself very well to a pin.
2) TMNT - No brainer there.
3) Spongebob - See #2.
4) Greta Van Fleet - A band my 10yr old listens to because I got him into them.
5) Double Dare - A classic game show with endless possibilities for a pin. A must watch when I was growing up. A must watch for him now.
Themes that strictly go to kids may not work, but if they also have a connection to the generation of people who have the disposable income to fund these purchases, then you got something there.