Motorcycle Questions? Ask a Mechanic.
Good morning, it's defintely a career that can make you a good living and has room for growth and decent demand. Being older will work for you as far as better information retention and self discipline go. It's also a little easier to find a job vs younger guys who employers might have reservations about their work ethics.
Most shops would hire someone on while in school but you would be limited to the scope of work you did and likely supervised closely. Both good things as you can pick up tips and tricks from older techs to augment what you learn in school, nothing beats real world experience.
My final bit of advice is to research schools and look for one's with good job placement programs and percentages.