These changes are usually seen as part of aging. The indentation on thecal sac
can later progress and cause compression over the nerves in the back which will cause pain and other problems. Many joints in the body which are mobile are prone to wear and tear. This process is only partially reversible as one ages and so the changes accumulate. This changes present with joint pain and restriction of mobility referred to as osteoarthitis. Physical therapy
and lifestyle changes will be most beneficial for you at this stage.