Panels fail two ways: impact damage - a car bumper, a bike, a ladder - and slow failure from age, where steel thins, rusts at the bottom seam, or the seal channel cracks and lets moisture in. With a median build year of 1963 for homes in Palo Alto, a meaningful share of doors here are closer to sixty years old than thirty, which puts them past the point where panel steel holds up the way it did new. The area's mild temperate climate keeps rust slower than it would run in a wetter region, but it doesn't stop it, especially on doors that have never been repainted or resealed at the bottom panel. Combine that with median household income here running well above the wider service area - households here report a median near $220,408 - and we see more owners choosing full sectional replacement over patchwork panel repair, simply because the newer door pays for itself in fewer callbacks.