My cats still do that and they're both adults... we call it "the 2am freakout." Actually, one of my cats likes to slide on her side everywhere, dragging herself with her claws in the carpeting or on the bottom of our sofa. It's pretty hysterical.
I have a female calico (11 years old) that has somewhat recently started to lick me incessantly... she never used to do this, and maybe about a year ago started. I thought when she first started that it might have something to with a tartar/plaque build up and she was trying to "tell" me in her...