54 here and have tracked my PSA for over a decade, it started spiking two years ago and finally got over that 4 mark last year, that's when all the tests happened and the cancer addressed. I do hope that your spike is nothing to be concerned about, and at this point it is, but you should be proactive from now on and maybe ask for a PSE test to just confirm - same blood test but much more accurate than a PSA to know if your spike is cancer related or not.

As I was told many times: a high PSA doesn't mean cancer and a low PSA doesn't mean lack of. My urologist told me repeatedly about men with very low PSA's that had it and very high PSA's that didn't. This isn't yet an exact science, but the PSE is closing that gap.