New season. New trainers. New transformations. Renowned tennis star and certified trainer Anna Kournikova and fitness expert Dolvett Quince join veteran Bob Harper for The Biggest Loser: Battle of the Ages. Contestants are divided into age groups as they go head to head to prove that sheer determination, stamina and spirit defy the limits of age. Join us for an emotional season that doesn't care how old you are, just how old you feel... it promises to be the ultimate battle of the ages.