Two and a half!!
I know it's normal for a father to be proud as punch of his kids, but I gotta share this with you all. As I've mentioned, my 6-year old son (and by association, my 2 1/2 year old daughter) have gotten into the Who first via the Super Bowl, then by the movie The Kids Are Alright. That, plus the requests for me to play their songs in the car (honestly, they do request the Who).