Hello worried and welcome
Essentially what Barry said really and just to say please try not to worry.
My husband was in his early 70s when first diagnosed and has been treated and so far all seems well with him.
I assume since you have a "risk" score (like Barry I wonder do you mean the Gleason score) and dad would only have got that from a biopsy and possibly an MRI scan organised by the hospital?
If so then dad will probably have received a follow up appointment. If you do download the Toolkit it will give you and your dad an idea of questions you want to ask and take a notepad and pen (or record the conversation) to write down the answers. You'll never remember it all otherwise.
I hope dad lets somebody attend the appointment with him as it can all be a bit confusing.
Life will settle down for all of you because at the moment you are all going through the "what if" moments. Once a treatment plan is in place life becomes more organised.
Don't despair and try not to panic. There are lots of treatments out there and even those men in the incurable camp can live long and full lives.
Best Wishes
Sandra