Hard to tell without more information, your cardiologist will look at your body size, family history, shape of the aneurysm, other issues you may have and the risk of surgery in your condition (for example in my particular case my surgeon gave me >99% probability of no issues, so in his mind I should had it repaired, for others the odds could be way lower and they would have to be weighed against the probability of dissection/rupture), etc to make a recommendation.

At 5.0 you are in the realm of possibility, and unfortunately although there are studies to find other ways to repair ascending aortic aneurysms, open heart is currently the only truly effective solution.

All the best to you!!