Jacko,
I did it at 41yrs old but with previous military experience. There were 2 people on my course who were 33 & 34 with no experience and they both got through OK. However, the pass rate at the college is not high, I seem to recall that only about 60% get through. The flip side is that you could double your current salary in 8 - 10 years. Its a big gamble though. Good luck with whatever you decide.
Regards, ADIS