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...
13.
DAI CORNELL. Age: 30. App 0, Goals 0. FACT: Goalkeeper Dai made his professional debut for Swansea in August 2009 and didn’t make another senior appearance until a League Cup tie at Aston Villa two years later when on loan at Hereford United.
14.
JACK MARRIOTT. Age: 26. App 56. Goals 33. FACTS: In the first two matches of the Championship season, Jack could play against Luton Town and Derby County, the two clubs he has left to join Posh in his career. His last goal was at Luton in September, 2020.
15.
KWAME POKU. Age 19. App 0. Goals 0. FACT: Kwame has played two Africa Cup of Nations matches for Ghana. He made his debut as a substitute in a 3-1 win over São Tomé and Príncipe earlier this year.
16.
HARRISON BURROWS. Age: 19. App 37. Goals 1. FACTS: Harrison scored the first Football League goal of his career last season, in the final minute of a 2-1 defeat at Burton. The midfielder played in the same Posh junior team as Joey Evison who went on to play cricket for England Under 19s.