Get a class one medical first and do a modular course and keep your day job. Its hard work in your sparetime but there is less risk overall. You can lose your class one at any time and the risk increases with age.
Its true the forecast is that there will more jobs available by 2004 however I'm not convinced that there will actually be a shortage of fATPL's.
I started at your age and even if I dont get to fly the A380 I can carry on as a flying instructor long into retirement as long as I keep passing the medical. Which was always my minimum expectation.
TTFN
MJR