Hello there,,,,well most probably it is bcos of the ageing process that the joint surface gets eroded and decrease synovial fluid in joint results in knee pain...there can be many factors for it....if it is due to ageing or if at all you are overweight...physiotherapy exercises along with electrical modalities and supplimentary therapy of
calcium,univestin and Antioxidant would bring you relief,,,however if there are other reasons like harmonal,systemic or Anatomical joint problem then furthur course of action is recommended.
Next Steps
visit a orthopadecian/Physiotherapist with Xray of both the knees in AP and flexed lateral poaition...do blood analysis for CBC,
calcium,
uric acid,RA factor,
Thyroid function test.
Health Tips
wear a patellar hole knee brace when ever you go out of the house,,,,try n reduce stair climbing prolong standing and no cross leg sitting.
Regards & Take care.