Ali,
Have you thought about doing an assessment ?
Consider the RAF based one offered by GAPAN at RAF Cranwell.
If you get a high score it gives you a lot of encouragment, if you get a low / average score it dosn't say that you won't make a pilot, it may be just a bit harder. (cost £150, one day)
Also, are you going to the Flight Training Exhibition at the Renaisance Hotel, Heathrow, 12/04/2003. Almost all of the FTO's will be there - you can grill them all in one day.
Finally, remember that some Airlines are staggering their intake age to avoid multiple retirements at the same time.
good luck