I'm 39 and had a Medtronic Mosaic Porcine valve implanted to replace my tricuspid valve -my surgeon's preference, for hemodynamic reasons. The longevity of this valve is expected to be greater than average because it's on the right side of my heart, where the pressures are much lower. A mechanical valve is not a favoured option in this position, as those same low pressures require a higher INR value to be maintained.
I had my surgery at the Royal Brompton Hospital in London, which is at the forefront percutaneous valve implantation via the femoral artery or the ventricular apex. They're not using this technique in many younger patients yet and I had OHS on this occasion. However, I was assured that however long my current valve lasts, my next replacement will be done via the percutaneous method and that can be done as many times as is necessary. Obviously, that depends on me going to the same hospital too.
The valve choice decision is a difficult one, but to a certain extent it was taken out of my hands. I don't envy those who have a less clear cut decision!