Centre-back and skipper Mark Beevers is the oldest at 31 with teenage defender Ronnie Edwards the youngest of three 18 year-olds. Aaron Powell and Ricky-Jade Jones are also 18.
Here are some facts about the men most likely to be entrusted with keeping Posh in the Championship...
5.
MARK BEEVERS. Age: 31. Apps 86. Goals 0. FACT: Centre-back Mark is the player in the Posh squad with the most Championship experience having played 170 times in the second tier for Millwall and Bolton.
6.
FRANKIE KENT. Age: 25. App 84. Goals 4. FACT: Defender Frankie’s first major honour arrived at the age of 12 when he won the English Schools FA Cup with Shenfield High School. He scored in the final which was played at Molineux, the home of Wolverhampton Wanderers.
7.
SAMMIE SZMODICS. Age: 25. App 56. Goals 20. FACTS: Forward Sammie has yet to score a hat-trick in his career. Last season he scored two goals in a game on five occasions. Sammie played 97 minutes of Championship football in his short spell at Bristol City.
8.
JACK TAYLOR. Age: 23. App 51. Goals 9. FACTS: Midfielder Jack played with older brother Harry in the Chelsea Academy and at Barnet. Defender Harry (24) is still at Barnet. Posh picked up just eight points when Taylor missed seven games in a row last season.