My husband has an ascending aortic aneurysm that has measured 4.8 cm for the last two years; it was first seen on an echocardiogram at Mayo in Jan 2021; at that time he was 77 years, going on 78. He was advised not to lift anything over 30 lbs and he has been careful. Hot tubs and hot swimming pools are "not his thing." No problem or question there.
The Mayo surgeon looked back at his records and saw a CT scan that showed a mid level ascending aortic value of 4.3. At that time or later a Radiologist wrote that this was "normal" for his height and weight. The surgeon said it was "not normal."
So I agree with the people above who urge you to talk to an experienced aortic surgeon or a cardiologist, who has experience with aortic aneurysms. They can evaluate you; your height ad weight; other factors that could affect the aneurysm such as family history, any vasculitis, etc..
My husband's first cousin (same age) had an aneurysm in the exact same place as my husband. He was not aware of it. He had great health habits, including walking every day for three miles and lifting weights. The aneurysm "tore." He almost died. He was airlifted to a great CV hospital with lots of experience but had a clot two days after surgery and now has memory, vision and other issues --including an inability to use his right side.
Exercise and muscles are great but clearly these aneurysms are unpredictable. The new consensus guidelines have reduced recommendations for surgery to 5.0 cm from 5.5. As I remember (and I could be wrong) this was because 60 percent of patients ruptured before they got to 5.5 cm.