Just to add to @moonboy comments, the aorta leaves the heart “ascending” and then bends down and “descends “ towards the abdomen, descending aneurysms have more options for repairs than ascending (open heart). Critical size start when the dilation starts approaching 5.0 cm. As Moonboy said, find a cardiologist who is an aortic disease specialist, it makes a huge difference.
Watch your BP, keep yourself active and treat your body well, you want to be in the best shape possible when and if you ever need surgery, again abdominal aneurysms (don’t know where on the descending side yours is) normally can be fixed with less traumatic surgeries than ascending, but surgery after all.
Take care and make sure you get monitored periodically just as Moonboy suggested.
Mine was repaired 5 years ago at 5.2 cm, found after an MTB accident , mine was ascending so I needed Open Heart. Knowing you have it is a blessing as you can monitor and plan.