This is a story about young friends: some who have become a little less young, but who have kept themselves from growing too old, too soon, by supporting and mentoring the next generation. Poignantly, however, it starts with a man who was himself cruelly denied his share in that gratifying, repeating cycle among horses and horsemen. Because it was his lamented friend Alex Scott who, hearing that Luke Lillingston was off to New York, made an introduction that proved critical to his career. "This was, what, 38 years ago now,"...