In a house built around 1987, the pattern we see most is a chain drive that's had at least one replacement opener already, now aging into its own board trouble - the motor runs, you hear it, but the door doesn't travel, or it travels partway and reverses.
Moderate heat through the warmer months does a number on aging capacitors and sensor lenses; a sensor that's slightly out of alignment from heat expansion in the mounting bracket can stop a door from closing at all, and owners often assume that's a motor problem when it's really a $20 alignment.
Other common signs: a remote that used to work fine and now needs three or four presses, a wall button that's stopped lighting up, or a door that closes but immediately reverses a few inches off the floor - that last one is almost always the sensors, not the motor, no matter how it looks from the driver's seat.