A door built for a 1972 opening wasn't engineered for the weight or wind load that current codes and materials assume. Millington sits in the same cold-moderate climate band as the rest of the service area, which means wood and steel both take a seasonal beating - expansion and contraction at the seams, moisture working into untreated jambs, and hardware that was fine for forty winters finally giving out. On a house built right around that 1972 median, you're often dealing with the original opener-to-door pairing too, which means a new door sometimes exposes an opener that's been due for replacement for years.
The area immediately around Millington - out toward Munford, Atoka, and Gallaway - shares a lot of this same older build pattern, so the fault lines repeat: narrow track clearance, hardware gauges that newer doors don't match, and headers that need a look before a new door goes in clean.