Regular knee and bone pain at age 64 can be due to age-related bone weakness, osteoarthritis, low calcium intake, vitamin D deficiency, or reduced muscle strength. Along with proper diet and exercise, calcium and protein supplements mixed with milk may help support bone health, muscle strength, and overall energy levels. Doctors often suggest supplements like Ensure, Ensure High Protein, Protinex, or Shelcal Total because they contain protein, calcium, vitamin D, and other nutrients that support bones and muscles. These powders are commonly taken with warm milk once or twice daily, depending on nutritional needs. Light walking, sunlight exposure, stretching, and knee exercises may also help improve joint flexibility gradually. Consult your doctor before starting supplements if you have kidney disease, diabetes, or high calcium levels.