[gsxrken]

PSA goes up as you age. And as said earlier it can go up due to benign enlargement or inflammation. Often they will retest after a 10 day course of antibiotics, no caffeine and no nik-nik for a few days before the test. If it is the same, then the biopsy.
At 73, even if biopsy comes back positive, I would seriously consider what they call watchful waiting. Too many stories of impotence and incontinence in older guys after the docs are done. My father has it too, and he says he wants to die with it rather than from it.