Correct..Those under 66 tend to have more active immune systems which causes the body to burn through and calcify non mechanical valves at a faster burn rate than those over 65. I was suprised to find out that TAVI/TAVR still leaves the old valve in you and should be retitled "Valve in Valve". Correct me if I am wrong on any count.I have read that bioprostheses last longer in patients who receive them when they are older. I got mine when I was 66. My surgeon told me to expect to need a replacement between 8 and 12 years out. He also assured me that it could most likely be done transcatheter. This is a reassuring video. It is important to go with a highly experienced and competent team.