I still have my original mechanical (ball-in-cage) aortic valve that was implanted in 1967, when I was 31. In a couple of months, I will be 85 years old........and the valve, at 53+ years old, continues to work although, at my age, other things are breaking down. The Starr-Edwards "ball-in-cage" valve was the first commercially available valve in 1961and was produced by Edwards Lifesciences, with little change until 2007 when it was discontinued. Since my valve was one of the first implanted valves, I doubt there are any older than mine still clickin'..........but you never know
. I sure didn't figure mine would last this long.........neither did any of my doctors.