Crestline's housing stock centers on 1966, which puts it close to a decade earlier than the broader San Bernardino area median of 1979. That matters more than it sounds like it should. A door installed in the mid-60s almost never has the same spring configuration, track width, or opener mounting as something built in the late 70s or 80s. We see a lot of older extension-spring setups up here, sometimes retrofitted once or twice over the decades with whatever opener was available at the time, rather than replaced as a full system. With roughly 4,047 households in the area, that's a meaningful number of doors running on hardware two generations behind what you'd find on a newer street a few miles down the hill.
We're not guessing at this from a windshield survey - it's what shows up when our trucks get called out here. The age of the house tells us more about what's likely wrong with the door than the symptom the homeowner describes on the phone.