I am not a doctor.
Well done on getting things investigated. Sometimes, the heart murmur can get worse as you age hence the active monitoring of your heart as you age.
Depending on the severity, it may mean surgery to repair the valve or replace it in the future. If caught early enough, and now you know you have it, it should mean that your heart won't fail in the future. This can happen if the murmur gets significantly worse with no interventions.
Yes, it has occurred in people I know who are pilots. He was told that if the surgery hadn't have happened, the heart probably would have failed in his 50s.