The answer to the crossword puzzle is 'ACHES'. ACHES are a common symptom of aging, and can be caused by a variety of conditions such as arthritis, fibromyalgia, and muscle strain. They can also be caused by physical activity, stress, or even just sitting in one position for too long. ACHES can range from mild to severe, and can be managed with over-the-counter medications, physical therapy, or lifestyle changes.