Tom,
I too, am a long time runner since high school. Never fast enough to lead the pack, but definitely a strong, competitive "middle of the packer". I had surgery last year at 43. I knew going in, from reading this forum, my running times were going to decline. Indeed they have. Few, if any, "valvers" that i've heard of have re-established their previous times. However, there are a few things that keep me plugging away. First off, at 44 y/o, I know i've already seen my P.R. regardless of the valve. Secondly, at 44 y/o, I am still faster and can go longer than most men 10 years younger. Am I "the man I was" a year ago? No, not quite and that does admittedly bother me some, but not enough to complain about. I figure time will eventually even things out. At least with the valve replacement behind me, now I can live my life the way I want to and do all the thing I want to without worrying about my heart. That's a big load off my chest that DOES make running easier...and better.