Fairfax Station's housing stock centers on a median build year of about 1982, later than the 1960s-70s houses that make up much of the rest of the area covered from Vienna. That later build date means fewer of the original one-piece wood doors and side-mounted extension springs that still turn up on older streets nearby - most Fairfax Station doors are steel sectionals on torsion hardware from the start, or a straightforward replacement of the same.
The area also sits in the same cold, seasonally harsh climate band as the rest of the region, which stiffens grease in openers and springs and shortens spring life a little each winter regardless of when the door was installed. With roughly 4,159 households in Fairfax Station and a median income above $212,000, garage doors here also tend to be replaced or upgraded sooner than doors in older, lower-turnover parts of the area - so what we see on a service call skews toward failed hardware on a door that's otherwise been well kept, rather than a door that's simply worn out.