hello this can be due to old age or diabetes,what ever you can try these medicines. Arthorem tab,one tab,three times daily,after food, dhanwanthara pills 2 tab twice daily after food, dhanwanthara thailam apply on the knees slightly rub it twice daily.

Don't worry check for following * Avoid using cold food and drinks *Try to be away from cold air by covering your body parts * Avoid skipping the food at proper time, and take hot food with ghee * Use seasam oil for application and followed by hot fomentation *Use shunti, alovera fresh juice with hot water early in the morning

Dear attach all reports first so that I diagnose the case and then prescribe you best medicine for your problem

In your age the reason for Knee joint pain in maximum cases is OSTEOARTHRITIS or Sandhigat Vata in Ayurveda.