Finding prostate cancer at a younger age, even slow-growing varieties, could tip the balance in making treatment choices. "If you diagnose the type of cancer that appears to be non-aggressive in a 50-year-old man, it's likely that that particular cancer, as it appears at that moment, does not need to be treated," Tomlins says. "We know from the behavior of those tumors that that sort of tumor has almost no chance of spreading outside the prostate. However, if you take those men and follow them over 20 years, the men that get treated do better than the men that don't."
Source : https://health.usnews.com/health-news/patient-advice/articles/2016-03-02/8-things-younger-men-should-know-about-prostate-cancer