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If you look at him he looks to be in his early 20's.

EDIT BY DROPHYD167b: Judging by a save transfer to a Jak & Daxter game, Ratchet is 18 in Deadlocked, making him 23 in the latest game.

Well if we go by the years since dreadlocked... he'd be 26 now? Maybe 25 depending on his birthday... 

Deadlocked's events were in 2005, It's now 2013, it's been 8 years since then...

So he'd be like 26 at the most i think