Who would win in a fight Chuck Norris or Jason statham if they were both in their prime?

It wouldn't matter about being in their prime. The Chuck Norris jokes exist because there is a thread of truth about them. Chuck Norris is a mixed martial artist with an 8th Dan black belt in Tae Kwon Do as well as other rankings in other Martial Arts. He has competed internationally and fought well against Bruce Lee.

Despite being 71 it is entirely conceivable that Norris would not just defeat but easily defeat the much younger and fitter Statham. Statham is an athlete and a former professional diver and whilst undoubtedly tough he lacks Norris' sheer weight of training and experience.