The majority of
People are treated non operatively with spinal stenosis
which is generally due to diffuse aging of the spine with the facet joints overgrowing and the discs degenerating and bulging as they collapse .
About 15% improve with time, 15% get worse & the rest remain as they are. Of those that go to surgery, most do well until about 5 years postop, with some regressing do to further degeneration.