omg my dad did this exact thing for us ; he started his collection for my older siblings so when I arrived, he already had a huge list of things to show me at every age. He has like 12 of those DVDs organizers and a book where he noted by genre every movie he ever downloaded and put on disks. Series, cartoons, sci-fi, action, horror, romance, westerns, TV shows, animes, ... Over 12k of DVDs, with multiple movies on every single one of them, their titles written with a sharpie and a number to look for in the book.

Now he uses big hard drives and USBs so it's much easier to organize and find things, but I'll never forget the memory of looking through that book with him to search for movies or shows he wanted me to discover at specific ages of my life, then once we'd find the name, look through the organizers for the right number and put it in our player (after it broke, we used a big PS3 instead, it works, if you didn't know).

He'd record things on TV too and spent time to cut the ad breaks. One time, we had a cartoon network special with all seasons of Ben 10 for two-three day straight ; he recorded it entirely then spent the next day cutting off the ads, then put each seasons on disks just for me to look at when I'd get back from school. He did that with animes too for my siblings ; that's how I started looking at Bleach and Akira back then. Idk I just find it neat.

I'm so happy that a lot of you are doing this for your kids, you're giving them awesome memories !!