Most of the housing around Yorba Linda went up between the late 1960s and the 1970s, with the broader build-out running 1938 to 2007 and a median year around 1968. That matters for garage doors because a huge share of the original hardware in this area - torsion springs, extension springs, the steel tracks themselves - is well past the design life the manufacturer rated it for, even if nobody's touched it since the house was built. A spring that's lasted fifty years didn't age in a vacuum; it cycled thousands of times through heat and whatever moisture got into the garage, and it's closer to failing now than it was a decade ago. The mild temperate climate here is actually kind to the metal and the wood doors that are still around - no deep freeze-thaw cycle, no coastal salt air eating at hardware the way it would closer to the water. That's the one thing working in your favor. It doesn't stop a 50-year-old spring from snapping, but it does mean the tracks and hinges on these older doors have usually held up better than the spring that's carrying all the weight.