Suggest Treatment For Prostate Cancer

My 61 year old father has been diagnosed with Advanced Level IV Prostate Cancer. He has been healthy in the past beyond arthritic knees. His PSA score was 60 the first test; the 2nd test was 4 (before any treatment). He did not tell me of his condition until 5 months after his diagnosis, and because of this, I am afraid to ask him straight-forward questions. His cancer has spread to the lymph nodes and there is evidence of bone metastases. I don't know how scared I should be. Does he has months or years to live? He is currently taking hormone therapy.