Routine PSA testing isn’t recommended for men aged 70 and above. Whoever ordered it did you no favor. Even the American Urological Association generally advises against this, and they just love urological surgery. Similarly, the US Preventive Services Task Force advises against this screening test at age 70+. Prostate Cancer is a usually slowly progressing disease, and the PSA test has plenty of false positives.
An older friend of mine was in a similar situation last year and I advised him to ignore the test result. Following up on it is more likely to do harm than good.