What is AF with FVR treated PHF. Repair or replace is not an age issue. What is related to age and valve replacement is what type of valve would be appropriate. A biological valve would be the best choice for an older individual and is not recommended for a younger person as the expectation for the valve is less than 15 years. A mechanical valve lasts longer but requires a lifetime of taking blood thinners due to the risk of blood clots.
Sometimes the valve can be repaired depending on the underlying cause...repair doesn't require open heart surgery and there is faster recovery time.
Thanks for sharing, and if you have any further questions or comments you are welcome to respond. Take care,
Ken