A big share of the houses in this service area were built between 1964 and 2003, with the median landing around 1978 - old enough that original torsion springs, if never replaced, are well past the cycle count they were rated for. Springs are rated in cycles, not years, and a 1970s-era spring that's never failed is often close to the end of its life rather than evidence it was built to last.
The climate here is mild with occasional freeze, which is gentler on doors than a true freeze-thaw climate, but it still means steel hardware goes through enough temperature swings each year to stiffen grease on rollers and hinges that haven't been serviced. A door that moved smoothly all summer can bind up on the first cold snap because the lubricant thickened and nobody noticed until the opener started straining against it.