I didn’t realize the vast majority of Goo Goo Dolls fans were teenagers until I got to GM Place last Saturday (July 24) and discovered that the food concessions were pushing candy floss more aggressively than beer. I guess I should have known, considering how the Buffalo trio have gone from being power-punk regulars at Vancouver’s now-defunct Town Pump to MTV-approved poster boys for mainstream pop.But when the band hit the stage and blasted into “Dizzy”, the pummelling leadoff track from its new Dizzy Up the Girl CD, I didn’t really care that I was a codger among the kids. Radio-friendly or n