White Center's median home was built in 1975, which puts it ahead of the broader service area's 1983 median and squarely in an older bracket than most of the 35 communities we cover. That eight-year gap matters more than it sounds. A door and opener installed in the mid-1970s has usually been replaced once already, sometimes twice, and what's on the house now is a mix of original steel track from the build and a retrofit opener bolted on sometime later. We see a lot of extension-spring setups here rather than torsion - extension springs were still common residential hardware through the 70s before torsion systems took over new construction in the 80s and 90s. With roughly 5,742 households in White Center, that's a lot of doors running on hardware nobody's made in decades. If your springs are the two long ones stretched along the horizontal tracks rather than a single spring over the header, that's your 1970s tell, and parts sourcing for the pulleys and safety cables on that system is slower than for a modern torsion spring.