Do doctors place a patient age limit on what procedures they will perform?

My 86-year-old friend of mine is experiencing excruciating knee pain to the point she is practically an invalid and it is causing her heart to fibrillate. She told me that her doctor said she is not a candidate for knee surgery. He also will not order a colonoscopy for her. I just wondered if the doctor's... show more My 86-year-old friend of mine is experiencing excruciating knee pain to the point she is practically an invalid and it is causing her heart to fibrillate. She told me that her doctor said she is not a candidate for knee surgery. He also will not order a colonoscopy for her. I just wondered if the doctor's reticence could be due to her age and if there is an age cut-off for medical procedures.
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