In my case I've been out of pokemon cards for around 20 years. I still would get the game console games every now and then(last one I bought was pokemon X/Y). But I haven't actually been in touch with pokemon and pokemon cards for 20 years. 

I was moving things around in my garage and making space for a home gym and I stumbled on some old taped up cardboard boxes that said "cards" on it. And I opened them up with my dad and I realized they were all of my old DBZ, Pokemon, and Yu Gi Oh cards. 

I felt like a kid again going through the cards and going "omg I remember that pokemon!". It made me feel nostalgic again forsure. And I wasn't exactly sure which card had the most value other than assuming Shiny cards have more valuable.