Across the seven named areas we work most, the housing is overwhelmingly 1960s and 70s stock, which puts a lot of garage doors well past any reasonable service life even if they look fine from the driveway. With the broader build range running 1967 to 2004 and a median around 1975, there's a real split between houses with original equipment and the newer end of that range with factory openers and lighter steel doors.
The older half is where we see side-mounted torsion setups and single-piece doors that modern track hardware wasn't designed to pair with. Owners who've added a new opener to that older hardware sometimes get a door that technically runs but strains the motor every cycle. The newer end of the range, closer to 2000s construction, tends to have sectional doors on standard torsion springs, which are easier to source parts for.