A spring's lifespan is measured in cycles, not years, so a door installed when Village St. George was being built out in the mid-1980s is now well past the point where most torsion springs give out - most are rated for somewhere between 10,000 and 15,000 cycles, and a daily-use garage door run twice a day for close to 40 years has long since used that up. The area's mild climate with occasional freeze doesn't stress the metal the way a harsher climate would, so springs here tend to fail from fatigue rather than from rust or brittle cold snaps. That's a small mercy - it means failure is usually predictable rather than sudden and weather-driven, and a spring that's visibly sagging or squeaking on the shaft is telling you it's close, rather than failing without warning.