All DVC resorts terminate at a date set when the condominium association for that resort is first established. The oldest DVC resorts - OKW, HHI, VB, BWV, BRV, BCV - all terminate on January 31, 2042. SSR was the first one to have its "own" termination date (January 31, 2054) and all new DVC resorts established after that have termination dates approximately 50 years from their creation.
In other words, as of February 1, 2042, my husband and I will no longer be DVC owners (BWV is our only DVC home resort).