I had mine repaired at 54 years old, 5.2 cm, and also have a BAV. The risk of surgery depends highly on your overall health and physical fitness as well as whether you have other conditions that may complicate things, I don’t know how the nodule affects this surgery but the surgeon will tell you. In my case the stress of having a time bomb was stronger than any fear I had about the surgery.. I was in good physical health, never smoked and had no other issues so my surgeon gave me really high probability of no complications, he also told me that if my valve was in good shape he would leave it as my natural valve would be better than any artificial valve he could use. I had my aorta repaired 2 months after the AA was found , and he ended up leaving my valve, I will have to have it replaced at some point but now that the aneurysm is gone it can be done through catheter (my mom had her AV replaced at 88 with no issues ). Everything went smoothly, I was in the hospital 5 days and back to work in 3 weeks. Everyone is different so ask a lot of questions, make sure you have the most experienced cardio thoracic surgeon you can find and get a cardiologist who is an aortic disease expert, not all of them are, it makes a big difference. Mine was recommended by the surgeon and he is now my cardiologist for life, he checks me every year (graft and valve) and every 4 orders a full aortic scan (3 hours) to ensure no other aneurysms are appearing. It is known that BAVs are big contributors to aneurysms and not only aortic (I also had a brain aneurysm repaired). I hope everything goes well, if you need more info let me know