As the founder and CEO of MyRacehorse.com, Michael Behrens dreamt about days like this, winning a race at the highest level. So when Seize the Grey (Arrogate) crossed the wire first in the GI Preakness S., Behrens felt like he was living a dream. But so did the 2,570 individuals who invested in Seize the Grey, buying micro shares in the 3-year-old colt. And no doubt, so did the 88-year-old Hall of Fame trainer Wayne Lukas, who keeps making the statement that age truly is nothing more than a number....