I am turning the big 60 this summer and guess maybe I am having a 3/4 life crisis and need to prove myself to myself. I have run a few marathons but the last one was in 2004. I am in pretty decent shape and do a lot of hiking mixed in with a little running. Knees and such are good. Does anyone here have experience with marathon training plans for old farts? The one I used 20 years ago was basically putting in miles with cross training mixed in.