Hi mate,
Im exactly like you.. I am 29 years old and have worked on cars and bikes since I was 16, in January this year I got a job as a Light aircraft engineer and its the best thing I have done.. I am not going to college for it as I can't afford 2 years out of my life (wife and 2 kids) but am learning on the job, I need a minimum of 3 years on job anyway so it works out well.
I am currently doing my PPL and as soon as I finish that I will start studying for my Engineers license, if you are interested in aviation and fettling with Planes then do it... Its a great move
Regards