Cold is the main driver. This area sits in a severe cold-winter band, and steel rollers don't tolerate that well - the metal contracts, old grease stiffens or dries out entirely, and a roller that was already worn starts binding hard on the first cold morning of the season. In a house built around 1972, that roller has had fifty winters to get to this point, more if nobody's touched it.
With about 1,518 households in Pleasant Valley, and most of the stock dating to that same early-70s build wave, this isn't a one-house problem - it's a pattern tied to the age of the neighborhood. The doors that get quiet, easy rolling now are almost always the ones where someone already swapped the rollers once. The ones still grinding are usually running what came with the house.