Depends on many factors. My husband had a CT scan in 2007 that showed a 4.3 aneurysm. No one mentioned it to him. Guess they thought based on his height and weight at the time that this was normal??????? He did not know he had an aneurysm until January 2021 when Mayo saw a 4.8 mid level ascending aortic aneurysm on an echo. They ordered a CT Angiogram with contrast.
In 2007 and until 2021, he was flying in airplanes on a monthly basis (maybe more frequently); was lifting very heavy "stuff," e.g., a 1000 lb garage beam, with the help of friends; boards for our dock; etc.. Thank goodness, he is still alive.
Two cousins have had mid level aortic aneurysms. One (a first cousin) desiccated (he survived finally) and the other had prophylactic surgery. Both were health "nuts" and did a lot of weight lifting. One cardiologist thinks that was the cause of the desiccation.