You're never too old to achieve your dreams. In the US, there is USAirways A330 pilot from New Hampshire who is a practicing ER doctor. I've also heard that AC has one also here in Canada.
Get your licenses and ratings and see where it takes you. In time maybe you'll be able to fly professionally and practice medicine. If it turns out that flying isn't for you; then you'll have something to fall back on.
Best of luck to you.