if Jax is 22, and he's been in the circus for years... how long has be been 22? or has he been in the circus since he was a teenager?

considering Gangle and Zooble have been there for many years, and Jax has been there longer than him...

What if he's 22, but has been there for 5 years? he might have gone into the circus at 17, or possibly even younger. His whole adult life could have been spent in there.