Preview 2 of 2 Rousey, 39, is the considerable favorite and that shouldn't come as a surprise. The former UFC champion would have likely been a heavy favorite had the two met in their primes and she's five years younger than the 44-year-old Carano. Rousey hasn't fought since December 2016, when she came up short in a title fight against Amanda Nunes. After starting off a perfect 12-0 and taking the UFC by storm, she dropped back-to-back title fights and walked away.