No idea. I was probably exposed very young by my dad. I don't remember when I first saw any of TOS or TNG, I always remember knowing who they were. I do remember having a VHS copy of Star Trek IV: The Voyage Home when I was a kid, so I think that was likely one of the earliest things I saw, and it was definitely the most rewatched when I was younger. I do vaguely remember seeing my first DS9 (the one with Q) when I was a kid at my grandfather's house.