Highland Park sits in a region with severe summer heat, and that heat does specific damage to openers that owners don't always connect to the weather. Garage ceilings run hotter than the rest of the house all summer, and that's exactly where the opener's motor, capacitor, and logic board live. Heat cycling - hot all day, cooling overnight, repeating for months - breaks down plastic gears, dries out lubricant in the chain and rail, and shortens the life of capacitors well below what the same part would last in a milder climate.
In a house built around 1973, that heat has been working on the same hardware for a long time if nothing's been swapped. Original chain-drive units from that era used steel gears rather than the nylon gears that became standard later, so grinding and metal-on-metal wear show up before plastic failure would. Newer replacement openers installed since then are more likely to show the plastic gear stripping and capacitor failure typical of heat-driven wear.
Either way, the pattern is the same: Highland Park garages run hot for months at a stretch, and that heat is the main reason openers here fail years before the rest of the door does.