the current age limit is to be in training before your 30th birthday, so you have a little time.
PM me when you have more posts. A former student of mine was an instructor flight mech, got out went to the ANG and was a FE on Herks, then got a UPT slot. He is now a Guard Technician. I can put you in touch with him.
I second the motion on going to touch base with the guys at Carswell. Nothing like being in the ANG in your home town.
You might have to enlist first, but with your flight mech experience, should have a relative easy time going to the FE spot.
Good Luck