Hi there, so sorry to hear about your dads diagnosis. My father is 81 and was diagnosed two years ago with the same thing. It's very worrying. For me it was a roller coaster of ups and downs. I think the older he is the slower it grows. There are a lot of hormone treatments, and radiotherapy treatments that they may try. Unfortunately for my dad it's just a matter of time, as its in his spine and ribs now. So he takes his pain relief every six hours. Support him but look after yourself too. Kind regards.