Hi , I’m also young at 49 diagnosed at 48 with TAA at 4.3. And bicuspid valve with mild regurgitation. Also the only one in my family. I’m active as well. Based on my height and weight they tell me small and probably decades away or ever and less then 1 % chance of anything currently happening. I can’t know what will happen but try to stay positive but think about it still too much. If needed I will have to have open chest and valve replacement - (sure same choices as you) and aneurysm repair. Told 98-99% success at my current fitness level. I don’t have high blood pressure and don’t have any related symptoms. Supplements I used to take gave me palpitations so no more of that. I go in annually for monitoring. I hope for the best for us all and my family.