That's probably true re: Drew, but if he said, "You know Mike, even though these guys are new to us they aren't new to the league. Aside from our guys (Papi and Pedroia and Ellsbury) Victorino won a World Series with the Phillies, Napoli was in a few series with the Rangers, Lackey started and won a Game 7 for the Angels as a rookie. Gomes and Dempster have gone through the playoff wars. Heck, even Stephen Drew was a key player last year when the D'Backs were in the playoff race."
I think that's a little less disingenuous than saying, "Yeah, these guys are too young, they're going to totally fall on their faces in the second half."
You can't predict a bad fall based on age or experience. To illustrate, think back to the 2011 team, that team wasn't what Mazz may call young or inexperienced. A bunch of players from the 2007 team, the manager of the 2004 and 07 team, lots of "veteran leadership" dudes and they completely shit the bed. The point is, it really doesn't matter.