Thanks for your query.
More detailed information is required to a definite conclusion.
However, from the limited information available, you are apparently suffering from either stretching of the thigh muscle tendon at the site of its attachment just below the knee; or, you have developed osteoarthritis
A thorough medical examination of the affected knees and the limbs
will give us information about the cause. NSAIDs (anti-inflammatory pain-killers) will give you some relief.
Consult your doctor who will examine you and conclude the likeliest cause of your problem; order required tests, and- based on the reports- will prescribe suitable/modified treatment as advised.
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Fond regards and have a nice day
Dr. Rakesh Karanwal