My descending aortic aneurysm was at 3.6 c and my doctors have been watching it since 2019. It was growing 2 mm every 6 months. When it got to 5.5, my wonderful doctor at UCSF thought she should do surgery. The percentage of death, paralyses, or stroke was more than I was willing to risk. I have 4 children, and I did not want to be a hugh burden. But I sought a second opinion at the Cleveland Clinic in Ohio. They are considered the gold level in aneurysms treatment. The doctor there said, go live your life, play tennis, golf and enjoy yourself. He said a surgery at my age would not likely have a good outcome. Well, I got my softball glove out and started fielding grounders. It was so fun. But with-in three months I could tell something was different. I had a ct scan ant it had grown 8 mm in three months. Well, I put my glove away and am still on the tennis court but not hitting balls, just walking around gathering them together for my grandson's lessons. Hiking up hills might be a strain on your aneurysm. Mine grew to 6.3 very quickly, but I will admit I loved every minute I was active. So, you choose things like that. Be careful, or go for it, you have to decide if it is worth it. I have always been active, just going slow is very hard. I have been given 6 months to live at this point. I am at peace with this. I know where I am going.