I'm with James Tigris, Another Biggles and Dave Martin.
I'm 22 and just finishing a Masters degree in Physics. As much as I'd love to start my training now, I've decided to go into employment to try and save up for the training - but with a £15k student loan to pay off first.
That leaves me with a fair few years before I can save up the necessary cash, even with a reasonably well-paid job. So I think I'm going to be ~30 (at the earliest) by the time I can squirrel away the figure required, which does worry me slightly.