Well happy birthday to ya!
Don't underestimate the depth of classic rock. Sure there's fairly simplistic examples like Steve Miller, but other bands like Rush, Emerson, Lake, & Palmer, Yes, or maybe even some of the Doors stuff has enough complexity technically and musically for plenty of study. I'm only 27 myself, but since my early teens I've mostly turned to the classic rock era for many of my musical tastes, not being wholly inspired by much of the "MTV" era music. Well anyways, I'm just kinda ranting...welcome to the site!