Mine is a VJ, installed in 1972. Still going strong to the best of my knowledge although I do get some pain around the valve area. Interestingly, I had a CT after a recent bang on the head and one of the pictures was this funky green 3D animation type thing that seemed to show a disconnect just below the valve.

The Dr that looked at it didn't seem concerned so I reckon it's just something in the imaging program that does that.