How old is too old to be watching the show?

I remember watching a few of the episodes when I was much younger but I don't have much memory of it otherwise. I now have access to all seasons with the power of streaming but I feel a little late to joining the party, especially with the new movie coming out lol. Not to mention, the humor is targeted to younger children, no? (This isn't really a serious question, just kind of throwing it out there for discussion)