Springs, cables, and rollers all have a duty cycle - a number of open-close movements before metal fatigue sets in, not a calendar date. Houses built around 1978 have simply had more decades of that cycle than newer stock. In a mild climate with occasional freeze, like this part of the coast, the metal itself doesn't rust out the way it might somewhere with harder winters, so the failure is almost always mechanical wear rather than corrosion.
East Port Orchard sits about 2 miles from our Port Orchard base, so it's a short run for us, but the age pattern here is distinct from some of the newer construction elsewhere in the service area. Roughly 2,058 households sit in this immediate pocket, a small slice of the 43,074 households across the full territory we cover, and a disproportionate share of those East Port Orchard households are still on their first or second garage door opener. That's the practical reason calls from this side of town skew toward spring replacement and opener retrofits rather than fresh installs.