A 65-year-old male patient complains of crepitation and clicking in both temporomandibular joints; pain when moving his mandible to the right; ear noise; dry mouth; glossalgia. He has been using a complete removable denture for the mandible for 6 months. The patient has no history of rheumatosis. Objectively: the lower third of the face is shortened, mental fold is strongly pronounced, mouth corners are downturned, there are angular fissures and cracks. Palpation reveals crepitation during TMJ moving. What is the most likely diagnosis?