How long is it save to wait?

I have been told I have aortic stenosis for a few years now, calling it mild. (wait and watch) I am now symptomatic, with occasional shortness of breath, and slight but constant chest preasure. My results show borderline cardiomegaly, ( enlarged heart ) 60mm peak gradient aortic stenoisis with bicuspid valve and enlarged aortic root. My question is ,Can I drop dead of this? or is it something That will slowly get worse until treatment? Drs are suggesting root repair and valve replacement, but without a need of urgency ?????

[kenkeith]

Advanced condition will show moderate to severe cardiomyopathy (enlarged left ventricle and left atrium).  This condition will decrease the heart's ability to adequately pump blood into circulation and fluids will back up into the lungs causing pulmonary edema (congested heart failure) and death.  And an enlarged left ventricle can be the underlying cause for arrhythmia and sudden death. It usually is a slow process.  How long to wait depends on symptoms, progression rate (history) and should be determined by a cardiological surgeon.  

An enlarged heart increases the risk of surgery, and a surgeon considers that and other medical information.  A Mayo Clinic valve surgeon commented in an article the biggest problem he sees are patients that have waited too long.