With a median build year around 1988 in Memphis, the failure pattern is pretty consistent: steel rollers, decades of use, no lubrication schedule anyone kept up with. Steel-on-steel wears the track lip and the roller stem both, and once that stem wears, the roller starts riding crooked and grinding instead of rolling. The mild, humid coastal climate this area sits in doesn't cause the wear by itself, but it does mean grease breaks down and washes thin faster than it would somewhere dry, so a roller that might've limped along another few years somewhere arid tends to seize or crack here sooner. We see it most on doors that have never had a single service call - which, in a neighborhood this age, is most of them.