I think in general Captains in the UK are younger than places like US and Oz.
This is mainly because UK airlines will take people straight from a basic CPL/IR.
Personally I couldn't have afforded to do my CPL/IR at a younger age, but I know that some people with richer parents than mine have been able to do a course at Oxford full time, then go get a job.
Most airlines in the UK now it is possible to get a command shortly after getting whatever the airline's minimum hours requirement is, and this is generally not that high.
So I would say that in the UK not that surprising, particularly for those who could afford the course at a young age.