@donbuc I had my 5.2 cm ascending aortic aneurysm and aortic valve repaired 7 months ago when I was 72. My health was probably not as good as yours since I have diabetes and take 7 different medications to try and keep my blood pressure under control. My surgery went well. I didn’t have any significant complications and I was out of the hospital in 5 days. The recovery at home did take a while and it was about 3 to 4 months before I was physically back to what I was before surgery. I do still have some tenderness at the bottom of my sternum but it does not prevent me from doing anything. My self diagnosis is that I did not suffer any cognitive decline 🙂. I can’t guarantee you will have the same outcome but since you are in excellent health and if you are diligent about following the instructions from the hospital after you get out your odds are good that you will be able to play tennis again.