The broader service area has houses going back to 1938, with a lot of 1960s and 70s construction mixed through its 51 named communities. Muskego skews newer than that - its median year built is 1987, which puts a big share of its garages into the era of steel sectional doors on extension or torsion springs rather than the older wood panel doors on side-mounted hardware you'll find in some of the region's older pockets.
At a median household income of $116,361, Muskego also sits above the wider area's $109,038 median, and that tends to show up in the garage itself - better original openers, insulated doors more often than not, and fewer of the bare-bones builder-grade units we see in older, lower-budget construction from decades earlier. It doesn't mean nothing breaks. It means what breaks, and when, looks different than it does on a 1965 house three towns over. A door built in 1987 is now pushing 35-plus years on its original hardware even if it's never given anyone trouble, and that's about the point where springs, rollers, and openers all start failing around the same window.