My son (23) has a bicuspid aeortic valve and his cardiologist told him that symptoms will tell him when he needs the valve replaced. If stenosis develops he’ll lose stamina making it difficult to walk up stairs, etc. That is when the valve will need to be replaced. BTW, it can be done intravenously now.
It is amazing they can do a valve replacement without cracking the chest.
I am in awe of the stuff we can do now.