In my non-professional opinion, your uro is being very reasonable to wait a bit and see where your PSA goes in a couple months. Any family history of 1st degree relatives with PCa? At 75 yoa, chances are, even if you developed PCa, you'd die with it, and not from it.
I can give you an example of a (IMO) 'non' reasonable uro. My aunt's nearly (at the time) 79 year old husband (no symptoms), who does have a family history (brother and father) of PCa hit a PSA high of 5.2 last year and his local uro wanted to subject him to a biopsy. At his age he wanted none of that so he asked me to take him to Johns Hopkins for another perspective. He saw my doc, Dr. Carter, and showed him his PSA records, etc. When he asked the doc what he thought he should do, the doc said "I'd do nothing. At your age you're not likely to die of cancer. Call me back if your PSA goes above 10." That was one happy guy when he walked out of there!
51 yoa at Dx--Some family history of PCa
From 9/2013 to 3/2015 PSAs between 4.85 & 6.7, TRUS Bx-neg 12/2013, 12/2014 PCA3:38, 3/2015 switched from local urology group to Johns Hopkins, PSA 5.8/FPSA 17.4/PHI 28.4, 3/2015 mp3T MRI & Fusion-Guided Bx @ JH, 2/14 cores pos, Bilateral, <5% involvement, GL=6, RRP: 8/2015 @ JH (Dr. Carter)
Post surgical pathology – Upstaged to G7 (3+4), confined throughout. Margins, LN (11), SV, EPE, all negative. Additional findings: HGPIN
PSA 11/2015 <0.1, 05/2016 <0.1, 9/2016 <.02 (new lab)
Post Edited (MDNative) : 10/20/2016 8:16:18 PM (GMT-6)