Hello there,,
Well knee pain is usually stress related at your age and mechanical in nature unless blood reports say otherwise....the fact that the knee pain has travelled from lateral side of left knee to central side of right knee does suggest a systemic problem...however detail onset of symptoms,treatemnt taken,nature of work,height and weight all have a part in conclusive diagnosis of knee pain.
Get back with detail symptoms and history of pain,,,along with xray if u have any proper proper treatment plan.
Regards
Next Steps
Dr Raviraj Francis
MPTh(Rehab),MPT(Ortho).UK