Someone correct me if I'm wrong but the decision for active surveillance is based on Gleason score, not PSA level. Surveillance is most commonly recommended with a Gleason score of six (3+3) You said your husband had a biopsy and should have been provided his score. My biopsy showed Gleason 3+4. If you search Gleason score you can learn the risk factors and recommended treatments for the different numbers (3,4 or 5). The score will have two numbers, with the first showing the stage of the most abundant cancer cells and second number showing the stage of the lesser abundant cells. My score showed I had more 3 than 4 development. Your husband's Urologist should have explained all this.

Prostate Cancer Foundation (PCF.org) has a good free dowloadable or hard copy of a prostate cancer tutorial.
Also, Patrick Walsh's book is an easy to read resource recommended by many on this site, including me.

And everything rockinat59 said is valuable.

karlarocha: you also may want to look at the National Comprehensive Cancer network (NCCN). As I understand it, they provide treatment guidelines followed by many doctors. They also educate patients. Here is a link for NCCN guidelines for early stage prostate cancer but they cover all stages, recommendations for patients and a bunch of information that helps a patient be a better collaborator/self-advocate: https://www.nccn.org/patients/guidelines/content/PDF/prostate-early-patient.pdf

I was just there. Depends on his numbers, my psa was 7, Gleason 4+3/7, I have opted for high dose radiation and hormone therapy. I know what your going thru, just step back and go slow. Get a copy of Surviving prostate cancer by Walsh. There’s all kinds of info online. You tube has some very useful videos. If he’s Gleason 6, active surveillance is usually done. I’m 59, diagnosed at 58. Just starting treatment got the shot next the radiation. I know it’s hard but at least he has the benefit of you, support him. I had no such support. I wish you all the best.