Fillmore sits 14 miles from our Camarillo shop, and the houses out there cluster around a median build year of 1975 - right in the middle of the 1956-1997 window we see across the wider service area. That matters more than it sounds like it should. A door hung in 1975 was almost certainly an extension-spring setup or an early torsion unit, built before the heavier insulated steel panels became standard. The tracks are narrower, the brackets are lighter gauge, and a lot of the original hardware is still in these garages because nobody had a reason to touch it until something broke.
We're not guessing at this from a city-wide average. Fillmore's own housing stock centers tighter around that mid-70s date than some of the newer pockets closer to Camarillo, which means fewer homes here got the 1990s-era upgrades that show up elsewhere in the area. If your door still has the look of something your parents would recognize, that's consistent with what's actually out there, not an accident.