54 is young for joining the club, so I'm thinking positive thoughts for your long-term good health. An important part of your self-education journey (which needs to occur continuously) is to make sure that any information about life expectancy is always reviewed in context to the age (median, average), the definition of metastatic spread, and the overall health of the participants. Rarely do I find all that information available.

I'm 52 and had my prostate removed at 42, and things were fine until last summer when my PSA skyrocketed and now I'm on Eligard/Zytiga for the past six months and my PSA is at undetectable levels. My metastatic spread is limited to 10+ lymph nodes in my iliac region, and while that isn't something that brings joy, it is very different then having it spread into the bones or organs. I also have a small lesion on my liver but the PSMAPET showed no uptake, so we discounted it. My oncologist doesn't give any guidance beyond 10 years but he puts me in the category of 10+ years.

Do you research and you will be informed, confident, and able to live a positive long life.