Around the age of 5:
Blondie
Michael Jackson
Hall and Oates
Kiss
Cyndi Lauper
Around fourth grade when I started buying albums for myself:
Madonna
Bon Jovi
Beastie Boys
Miami Sound Machine
Of all these artists, I'd say that the Beasties and Blondie are the only ones I still listen to, although I respect Cyndi Lauper and have love for Michael's Jackson's older music. It wasn't until junior high and high school that I started liking music where I still listen to most of it, like Tori Amos, U2, Morrissey, Concrete Blonde, Oasis, James, etc., etc., etc.
Edit: Actually, I remember listening to the War album when I was in the third grade. I didn't start buying U2 albums for myself until junior high/high school.