This is somewhat timely with the highly acclaimed Lincoln movie now bringing a new generation of fans to this instructive time in our history.
He found his calling late in life having failed at a number of jobs after leaving the army originally. Then came the Civil War. Here he found his calling as both a general and a leader. As the North worked it’s way through a parade of incompetent generals, Grant methodically worked his way up the Union ranks to be the Western Theater’s top commander. When Lincoln summoned him East in 1864, it was the beginning of the end for Lee and the Confederate cause.
Finding your calling does not always happen early in life.