At 66 with a Gleason 7 cancer without evident spread even with a high PSA needs to be given a chance for curative therapy. Robotic prostatectomy
gives the best chance for cure with minimum complications. High chances of node positive disease
Other option that you are considering of doing nothing will land up in Watchful waiting i.e. hormonal
treatment when you develop extensive disease. That option is exercised in older patients or if you have some other diseases making you unfit for surgery.
At your age, give yourself a chance