I feel incredibly out of the loop. I've seen references to these Animorphs books for years online, but I've never seen one or spoken to anyone that has. They were obviously popular, but I have no idea of when or where they were popular and it is starting to bother me.
I feel like the only reason I didn't get into Animorphs when they were super hot was because I was already into Goosebumps. If I could only get 1 book, it was for sure going to be a Goosebumps book.
I'm only a couple years younger (40 in February). It could have been regional, maybe (I'm in California). I just remember seeing them all the time in my school library and I knew at least 2 people that did one of them as book reports for class.
I'm 30 and we had Animorphs books in our house and at school as a kid. However, I think the original several books were kind of old at that point and not as popular.