With only 651 households in Hidden Hills, this isn't a place with twelve different eras of construction stacked on top of each other - it's a tighter window, centered on the early 1970s. That matters for parts. A door installed in 1973 is more likely to be running original galvanized torsion springs or an early extension-spring setup than the torsion-on-a-shaft systems that became standard by the 1980s elsewhere in the service area.
Income here runs well above the area-wide median of $153,444 - Hidden Hills sits at $250,001 - which tends to mean owners replace rather than patch once a system starts failing, but it doesn't change what's actually failing underneath the door. The hardware doesn't know what the house is worth.