question: MY LEGS ACHE ALMOST CONSTANTLY, SOMETIMES THE JOINTS TOO, AND ARMS ALSO.I DO HAVE ARTHRITIS IN MY LEFT KNEE AND THIS HAS PROBABLY SPREAD BUT THE ACHING AND PAIN IN MY LEGS IS FAIRLY CONSTANT AND 800 MG. IBUPROFEN DOESN T WORK LIKE IT USED TO. WHAT IS GOING ON? GETTING OLD??