I was 54 when the found mine after an MTB accident, my aneurysm was 5.2 at that point so recommendation was repair. I also have a BAV which are known contributors to the appearance of aneurysms. I was very active like you, biking, weights, swimming, yoga. I had my surgery 3 months after my leg surgery from bike accident, they left my BAV as it was highly functional. Being in good shape made the whole process “easier” (it’s never easy) my surgeon gave me >99% chance of no complications, I was out of the hospital in 5 days and back to work in 3 weeks, started exercising as soon as I was allowed, my leg was bigger obstacle. I also have to take antibiotics every time I see my dentist (it is the BAV that is very vulnerable to infections), I’m fortunate though my dental work is just cleaning, but still. When they found mine I just wanted it gone, could not have the surgery soon enough, I found the best thoracic surgeon near me, and through him a cardiologist who specializes in aortic diseases, they made a huge difference. Think you are one of the lucky ones who found out they have one before it was too late and can do something about it, the surgery is tough but the whole thing goes by quickly, you took care of your body so you’re in a good place. I also have two kids and get to enjoy them, one is in med school and writes to me every time something related to the aorta or valves appears, he is happy he gets to do that. Don’t be afraid of the surgery, just find an awesome team to help you, at 4.9 it’s a matter of when not if. It’s been 5 years for me and I’m as active as ever, no restrictions

All the best to you!!