Mount Prospect's 1969 median build year puts it squarely in the era when garage doors shifted from simple tilt-up single-panel units to sectional doors with more moving hardware - more brackets, more rollers, more places for age to show. That's a different failure profile than the pre-1960 stock closer to Evanston's core, where the doors are older but often mechanically simpler.
The area's 22,003 households sit in a colder building climate band, and decades of freeze-thaw cycles work on steel track brackets and roller shafts the same way regardless of income or house value. Combine that with a house that's had one or two hardware generations layered on top of the original, and you get doors that look fine and run rough - track slightly bent, spring slightly mismatched, opener slightly overworked. None of that shows up until it doesn't work at all.