Wolf Trap's housing stock centers on a median build year of 1981, which means a lot of the steel panel sections, hinges, and end stiles on these doors have never been swapped out since the house went up. That hardware is over forty years old. Steel panels from that era were rolled thinner than what's made today, and the foam core inside them breaks down with age faster than the skin shows. You get a dent that used to pop back out now staying put, or a bottom panel that's gone soft and won't hold a weather seal anymore.
We're in a cold-climate band here, and that matters for panels specifically. Freeze-thaw cycling works on the seam between old foam and steel, and once that bond lets go the panel flexes when the door runs, which stresses the rollers and hinges next to it faster than a solid one would. A dented panel on a door this old usually isn't a standalone problem - it's often the first visible sign that the section next to it is close behind. We look at the whole run before quoting one panel, because replacing a single section on a door this old sometimes means the new steel doesn't sit flush against gauge that's shrunk or warped with age.