Thanks to Dale, Don, and Doting Daughter.
Doting Daughter, maybe your father can convince his doc that the additional year is not necessary. For myself, I will probably do the three years if needed. The hot flashes are pretty bothersome, but I hope to become more accustomed to them (have only had one shot - 8 more to go ) . I will be 70 next b-day - hope to be around for grand kids, etc. until at least 85. I think that each case is different and doctors have their favorite treatments / protocols. Good luck to you and your father, whatever he and his doc decide.