A door built or installed around 1971 has had five decades in a mild, humid Central Florida climate to let rust work into the spring coils and the track bolts. Mild doesn't mean dry - it means no hard freeze to crack a panel, but plenty of damp air to corrode galvanized coating that's gone thin from age. We find pitted springs and track rails with surface rust well before the door itself shows any obvious sag.
The other piece is scale. Combee Settlement has roughly 1,761 households, a small slice next to the 84,289 households and 44,232 owner-occupied houses across the full service area. Fewer houses means less chance a given repair here was done recently by anyone - a lot of this original hardware has simply never been replaced, because nobody's had reason to until it fails.
Median household income in Combee Settlement runs lower than the service-area median of $59,346, which tends to mean repair over replacement is the more common call - fixing the spring or the opener rather than swapping the whole door. We work with that. A repaired torsion spring on a sound 1971 door frame can run another decade without issue; it's the opener motor and the cable, not the door itself, that usually give out first on houses this age.