I agree with @moonboy, get a second opinion ASAP, every two year monitor is not right. I was 54 when they found my 5.2cm aneurysm, I found the best thoracic surgeon in Houston and his recommendation was to have it repaired as soon as possible. He also referred me to a cardiologist who specializes in aortic diseases and he had the same opinion. In my case 5.2 was considered large for my body size and there was a history of aneurysms in my family, they also took into account my age, the fact that I was in great physical health, never smoked, and that made the surgery minimum risk. Find the best thoracic surgeon available to you, or go to a major heart center even if you have to travel, this is one of the cases when you do anything to get this resolved properly.
Good luck to you!!!