great quiz!!! the number one hit by an 18 yr old is the only one I'm going to admit that I missed. I answered "...Baby one more time" but Brittney was only 17. My mistake.
However, I have to object to missing numbers 4 and 10.
Incubus should also be a correct answer for number 4. And "Dont Be Cruel" was a hit for Elvis in the 50s, and for Cheap Trick and the Judds in the 80s.