Hello Duncan and welcome from me too.
My husband was 72 at diagnosis with a PSA of 5.7, Gleason 3 + 4 and originally T3a which was subsequently changed to T2.
He was on active surveillance for a whole year before he needed to make a decision regarding treatment.
It was his choice not to rush into anything but that decision doesn't suit everyone.
Research all your options, make a very considered opinion of pros and cons and once you've made a decision don't look back.
My husband was treated last year and has been happy so far with the outcome.
Good luck at the appointment on 24th August. Use the time by studying The "Toolkit" available free of charge from publications. An invaluable tool on which to base questions when you see the oncologist.
Best wishes
Sandra