On a 1971-era Farmersville house, the most common calls we get are torsion springs that have simply outlived their wind count, and tracks that have loosened at the jamb bracket because the original wood framing has shifted over fifty-plus years. We're in a cold-moderate climate band here, so metal fatigue from temperature swings plays a role too - springs don't fail gently in weather like this, they fail suddenly, usually on the coldest morning of the week.
Openers are almost never original at this point, but the chain-drive units installed in the 90s and 2000s are starting to show their age - worn gears, chain slap, limit switches that drift. We check the door hardware and the opener as separate problems, because on a house this age they usually failed on different timelines for different reasons.