A house built around 1978 was almost certainly built with an extension-spring setup or an early torsion system, not the current standard. If the door's never been swapped, you're looking at older style hinges, a lighter-gauge track, and in some cases a header that was never reinforced for a heavier insulated door. When owners here upgrade to a modern steel door, the jamb and header sometimes need extra bracing that a newer-build home wouldn't.
Climate matters too. This area sits in a cold-weather band with severe winter conditions, and a door from the late '70s wasn't built with the same weatherstripping or insulated panel standards you'd get installing new today. Cold makes old springs brittle and old nylon rollers crack - we see both fail together more often in houses from this era than in newer builds.