By Rick Porter August 25, 2011 6:00 PM ET Follow @Zap2itRick on TwitterThe 12th edition of "The Biggest Loser" will be a battle of the ages -- which is not a prediction of the season's quality but a statement of fact about the way it's organized this time around. At the start of the season, which premieres Tuesday, Sept. 20, the 15 contestants will split into three groups based on their ages -- under 30, between 30 and 49 and 50 and older.
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