I'm 45.
I liked Letterman when I was a teenager, because that was Letterman's level of humour. I liked Carson much more as I grew up.
The only thing I liked about Leno was that he was a genuine car guy.
Fallon? Meh... I'd rather take a nap.
Conan? Not a chance. I'd rather watch an hour long EAS broadcast with the volume full up.
Part of what made Carson great was his great guests and his nack for picking new stars. How many people did Carson set on their showbiz career paths?
What's Fallon going to do? Continue to interview de rigueur mediocrity like Chris Pratt?