I am 77 years old with PSA level above 20 but no signs of prostate problem. Also ultra sound test did not find abnormalities in the prostate gland surface. I am s competitor rowing person from last 15 years and row 4-5 days in a week on water in summer and rowing machine in the winter. I wonder if my PSA reading is high because of my rowing. I hesitate for biopsy because of its side effects.