That stands in stark contrast to lung cancer, which has a median survival time of ~15 months. Pancreatic cancer usually kills you in less than a year. Colon cancer is better, but still only ~6 years. Leukemia and Lymphoma can occur in middle age or even in early childhood, and rob an entire lifetime.
We also need to think about quality of life, which tends to go way down after you're diagnosed with one of these diseases
Prevention and delay is significantly better than management or even curing
That said prostate cancer is most of the time not a big deal. Getting prostate cancer will still probably the most dangerous thing that ever happens to you (how many single events have a 5%+ mortality rate? besides birth) and should be treated incredibly seriously, but the odds are still good you'll be fine.