"There is no specific normal or abnormal level of PSA in the blood." (cancer.gov)

We really need better information on this topic. From what I've read, some prostates generate more PSA than others. Some are larger than others (which also means more PSA). We don't know why. It doesn't seem reasonable to make people worry about PSA levels and try to reduce them without additional concerns.

I have had "high" PSA for years. I had multiple tests, including 3T MRIs. They haven't shown anything. My PSA levels can vary 3-5 points, depending on sexual activity.