Fullerton's housing stock is dense with 1960s and 70s construction, which means a lot of original garage doors are now pushing 55 to 60 years old - well past the point where steel panels resist denting or torsion springs hold their rated cycle count. That's not a weather story; this area sits in a mild temperate band, so we're not fighting the freeze-thaw cracking or monsoon rust you'd see elsewhere. It's just straight mechanical age, on doors that were installed once and never touched again.
Across the broader service area there are roughly 367,768 owner-occupied houses out of about 953,710 households, and median household income here runs $96,041 - high enough that a lot of owners choose full replacement with an insulated, better-sealed door rather than patching a 1960s original that's already lost its factory finish. We see this pattern most in the older tracts nearer central Fullerton and less in newer pockets closer to Placentia or Brea, where homes were built later and original doors have more life left in them.