Most garages in this part of the service area went up around 1989, give or take a few years either side. That's the window when steel sectional doors on torsion springs were becoming the standard replacement for the older extension-spring setups builders had used through the 70s. If your house falls in that range, the spring over your head is almost certainly a torsion spring on a center shaft above the door, wound to a tension rated for the door's weight and cycle count. A full repair means unwinding what's left of the broken spring safely, matching the new one to the door's exact weight and wire gauge, and checking that the drums, cables, and bearing plates it shares the shaft with aren't also worn out. On a door this age, the spring is rarely the only part asking for attention - it's just the one that failed first.