Sorry you've found yourself here but welcome to the fold and a great site for info and support.
As Nick suggested above. And I would also ask:
1) what is the PSAD score - the ratio of PSA level and prostate volume
2) What is the T stage? T1, T2a, T2b or T2c?
3) did the biopsy note any perineural invasion? (if PCa areas are bordering inner nerves of the prostate).
4) how many biopsy points where taken and of those how many positive of Gleason 3 and of 4.
I too am late 50's and on AS at the moment - and am being very 'active'. Not that I don't trust the decision but I'm the sort of person who likes all the data and be able to discuss with the urologist the thresholds to either stay on AS or move to treatment.