Thats true, they're only young but:
Terry began to establish himself in the Chelsea first team from the 2000-01 season, making 23 starts, and was voted the club’s player of the year.[19] He continued his progress during 2001-02, becoming a regular in the defence alongside club captain and French international Marcel Desailly. On 5 December 2001 he captained Chelsea for the first time, in a League match against Charlton Athletic.
He was 21 year old coming 22 and Chelsea regular and captained them. Thats very good for a CB that don't normally peak untill late 20's
edit: I was hoping Mancienne was going to step up and be a good player, but he's not looking so good at the moment for Wolves... But again, he's only young.