I can't seem to join a group in The Pro Football Pick'em game when using my Turbify email address, which is more convenient than launching a separate browser and dedicating that browser to my Yahoo! ID.
I get an error after creating a name for my picks suggesting I must be at least 13 to play.
(note: I don't have t he same problem when using any of the other Yahoo! Fantasy sports assets.
99% of the time my Turbify userID seems to behave as any other Yahoo! ID, except for this blocking quirk of the Pro Football Pick'em game.
Note there is no way to set my age on my Turbify account, which I've had for over 13yrs so that should qualify me as at least 13yrs old ;)