This is an excellent site for "shoulder to cry on", and sometimes we can answer questions.
You are at the worst point in this disease right now. The problem is that you or the doctors don't yet have enough information to know what is going on. For a lot of people they then start assuming the worst.
From the limited information you have posted it has a reasonable chance of being curable, and if not curable a high chance of being put into remission for about a decade.
If there was no lymph node involvement it would have been better, but with only one lymph node it is still ok. If you get a clear bone scan that would be good.
If you like putting numbers on things then I can give you two numbers for his chance of reaching the age of 80 years old:
If he was completely cancer free, he would have an 80% chance of reaching 80 years old, that is to say 20 out of 100 men will get hit by a bus or have an heart attack before they reach 80 years old.
Because of what you have posted, we can now say he has only a 75% chance of reaching 80 years old. Which is only a little bit worse than 80%. To put it another way he is four times more likely to die of something other than prostate cancer.
As you get more information, and we know what treatment he will have these percentages will change, but at the moment we just have to go with the limited information we know.