The style of TV storytelling has changed radically over the last few decades. The fact that you can't get into the new stuff might have nothing to do with your age, just what you're used to.
For me, I don't think I'll ever age out of "Star Trek." But I am changing my opinions on certain episodes and characters as I get older. In particular, I have far more appreciation for Tuvok, and Vulcans in general, than I did as a kid. I used to find them boring. I also used to think that I would just naturally become more mature with age. Maybe most people do, but I seem to have to make major efforts to behave like an adult. Emotional control is a daily effort.
For me, I don't think I'll ever age out of "Star Trek." But I am changing my opinions on certain episodes and characters as I get older. In particular, I have far more appreciation for Tuvok, and Vulcans in general, than I did as a kid. I used to find them boring. I also used to think that I would just naturally become more mature with age. Maybe most people do, but I seem to have to make major efforts to behave like an adult. Emotional control is a daily effort.