If it wasn't for my cardiologist's monitoring of me annually, and then semi-annually, I wouldn't have known that I had developed severe stenosis of my bicuspid aortic valve. One month ago, it was replaced with a tissue valve, and I expect he will continue the annual echocardiograms. I am 70.
Things are changing in the durability of tissue valves. For example, Georgia Tech did a structural durability study on the Edwards Inspiris Resilia valve, putting it through 1 billion cycles in vitro. Granted, the performance of the actual implanted valve could be different, but it's a strong indication of low probability of SVD. (At 65 BPM, 1 billion cycles would take about 29 years.) Here's the details...
Long-term durability of a new surgical aortic valve: A 1 billion cycle in vitro study - ScienceDirect
Journal of Thoracic and Cardiovascular Surgery (JTCVS)
https://www.sciencedirect.com/science/article/pii/S2666273621004162
Conclusions
In summary, this in vitro study shows that the Inspiris Resilia aortic valve performed well through 1 billion cycles of testing (the equivalent of approximately 25 years of use). All the structural components of the study valves remained intact, and the hemodynamic results were functionally equivalent to those for the zero-cycled control valves. Furthermore, the 1B-cycled valves exhibited similar flow field characteristics as the zero-cycled valves.
Conflict of Interest Statement
The authors reported no conflicts of interest.