The giveaway on these older La Puente doors is usually a panel that's visibly bowed or dented at the bottom third, right where a car bumper or a trash can lid tends to catch it. On a door this old, a dent doesn't stay cosmetic for long - the steel's thinner than what's rolled today, and a soft spot there starts to flex the whole section every time the door cycles, which puts uneven strain on the rollers next to it.
Sometimes it's not impact at all. A door built in 1958 has had a lot of years for the bottom seam to rust from ground moisture, even in a mild climate, and that rust weakens the panel from the inside before it ever shows on the surface. If you're hearing a new scrape or pop at the bottom of the door when it closes, that's worth a look before the panel fails outright.