not too old for a career change however with the way the industry is now and the ever rising cost in fuel prices. You might want to stay where you are. I love flying and have been lucky enough to fly for who I do and have for a few years now and it seams pretty stable however I do have a back up plan I am also a full time firefighter. So to make a long story short. Get your CFI rating and due that part time. You will get to fly for free and stay at the computer job you will still be making a good living there and be able to have some fun on the weekend.