It is every individual’s decision but At 67 and healthy I would listen to your surgeons, age will start doing its thing to your body and the aneurysm will just get worse if it doesn’t dissect/rupture first. I had my Ascending AA repaired 5 years ago at 54 and 5.2 cm, I was in great health and shape, my surgeon gave me >99% chances of no complications, the stress of having a time bomb was way stronger than any fear about the surgery. When I was 14 years old my next door neighbor who lived alone collapsed on the side of his house, moaning in pain, I jumped the fence and struggled to get him to his bed while my mom called an ambulance. He passed 2 hrs later at the hospital from a ruptured Abdominal AA. That experience it’s ingrained in my mind, when my time came I did not doubt a minute, chose surgery as soon as it could be done.
I wish you all the best!!!