I think surgery is a terrible idea for a man of your father's age. Please fill out the following nomogram for him:/webcore.mskcc.org/survey/surveyform.aspx?&preview=true&excelsurveylistid=4
What does it tell you is his risk of dying of prostate cancer in the next 15 years?
I'm not saying that he should not get treated - that is entirely his choice. But I am saying that not treating it may be one good option. They call that "watchful waiting" - and they would only give him hormone therapy if symptoms arise.
He can also have any of several kinds of radiation therapy, depending on what is available to him wherever he lives. SBRT is only 5 treatments and doesn't involve any kind of anesthesia. I guess that seeds (brachytherapy) can be done with just a spinal block. A man in my support group had SBRT at the age of 80 , had minimal side effects, and is doing well- except for his other comorbidities.