Steve Farthing posted a note for dick that says:
You have broken the Guiness record for longest surviving heart valve recipient!
50 years with the same ball-in-cage aortic heart valve!! The Guiness Book of Records lists the longest surviving heart valve recipient as Doris Clare who received an AVR in 1969. But you received your ball-in-cage valve in 1967 which is earlier than Doris! You should be the official record holder! Although Guiness is not very clear on defining how they measure the record. But it seems you have had the SAME mechanical valve for the longest time of anyone on the planet! Congratulations. Someone should tell Guiness.