I have participated and lurked on this forum since I was advised I had a 4.7x4.7 ascending aortic aneurysm when I was 60. Because I had and have afib, my selection at that time, if surgery was necessary, was going with a mechanical, since I have been on warafin since 2008 with no real problem maintaining levels. My cardio initially instructed me to quite my distance bicycling, but fortunately, the surgeon who I consulted countermanded those instructions indicating the cycling would be beneficial, and I have continued it. His advise appears well founded, as I have no real symptoms, other than those associated with my advancing maturity at age 67 (out of breath only slightly which is alleviated by asthma inhaler prior to cycling). The aneurysm grew slightly to 4.8 and has remained stable for the last 4 or 5 years. I guess I am one of the few that draws comfort from being in the waiting room, as I am the sole caregiver for my wife who has dementia. But now I would like others input on potential valve for replacement, as the guideline the surgeon (Dr. Cosselli at St. Lukes Houston) gave me back when I was 60 was that the standard normally leans to tissue valve after age 65. My concerns are the usual for this tissue, the potential for need for follow up replacement. I still want to remain active with ability to have a high rev exercising heart rate, and also concerned that tissue will not hold up to my activities. Input for specific valves also appreciated.