I watch shows that would normally be watched by kids and teens (I'm a full-grown man, even if I don't act like one). For example:
Barney & Friends
Peep and the Big Wide World (the newer 2000s version)
Arthur
Girl Meets World
Hannah Montana (when it shows reruns late at night)
Lizzie McGuire (same as Hannah Montana)
Dog With A Blog (same as previous two)
Jessie (again...same, though this one airs during the day, too)
Bunk'd
Stuck In The Middle
In addition to watching kids/teens shows (above is NOT a full list), I also have imaginary friends, though not all of them are human. In fact, most are animals and/or dinosaurs. The only human imaginary friends I have are ghosts that I've made up from my imagination. It's possible that there could be a real ghost or two in this house, but I have never seen them to confirm that. So, I use my imagination to make up ghost friends I can talk to.
Oh, yeah...I also have invisible imaginary friends that are not ghosts. So, watching kids/teens shows and having imaginary friends might be considered childish, but I enjoy them all.