User blog comment:Mobo85/Phineas and Ferb: Targeting Boys and Saving Lives/@comment-66.32.127.236-20110717155538/@comment-2156322-20110717164535

And according to this link, it was the #1 show in it is time period with kids 9-14, and boys 2-11, 6-11 and 9-14 (beating a Spongebob rerun nonetheless).