T1 means they detcted cancer on either the left side or right side of the prostate. T2 means they detected cancer on both sides. Either way, your headed to the same conclusion. Your Gleason scores tell you that you definitely have cancer and that at your relatively young age they will recommend removing the prostate and probably the lymph nodes in the area. If you don't have a copy of your pathology report, ask for it and they will send it to you. Mine came with a good explanation of the results.
I've been in science and engineering my whole career and I also had the natural reaction of needing data and looking up things like survival statistics. All of the papers I've read the average age of the populations in the study were 68 to 75 years old. At that age a lot of the people may be surgical risks or not have long enough life expectancies where they will undergo the surgery. The statistics can be misleading because there isn't enough data on people your age because anyone with the cancer at your age gets the prostate removed. There aren't too many people willing to let it go and see what happens for the sake of science. I have have a PSA of 0.75, Gleason of 3+3 and T1C. All of mine is on the left side and one region had 50% cancer. I have decided to have the surgery to knock it out so I can get on with my active life.
Good luck and remember that the doctors work for you. You should ask as many questions as you want and call their office if you want to ask any follow-up questions. Definitely get a second opion. Your doctor probably expects that.