PSA 1,356!

Only your own individual scans and tests and the opinion of an oncologist can give you reliable information about your condition. The PSA test is notoriously unreliable, some people with a PSA below 3 have aggressive cancer and some with a PSA above 80 have no cancer. However both of these cases would be extreme.

With a PSA above 50 it would be almost certain you have cancer, so with it being above 1000 you have cancer. What's more with a PSA above 100 it has nearly always spread beyond the prostate (metastasis). I would be very surprised if your cancer is still confined in the prostate, but it may have taken 20 or 30 years to get so extensive, so it may not be as aggressive as the high PSA suggests. Usually the Gleason score is the best way to determine how aggressive a cancer is, with Gleason below 5 being considered normal and Gleason 6 to Gleason 10 being progressively more aggressive. A Gleason score can only be determined from a biopsy, but they may not do a biopsy on you as it is already clear (in my none expert opinion) you have advanced cancer, and the treatment is the same once it is advanced, and that treatment is nearly always hormone therapy (degarelix) to suppress testosterone which will stop the cancer growing for a number of years. How many years varies sometimes as little as two, sometimes as long as 15. There are also trials of new treatments so you may yet live a long time.