Mars is my Destination by Frank Belknap Long

Unlike Jonathan Trilling, Commander Littlefield was the kind of man who was what he was in an uncomplicated way. You didn't have to try to analyze why he impressed you as he did, because it was all there on display, right out in the open. He was big and robust looking, with a granite-firm jaw and the kind of features that take a long time to develop the lines of character that are etched into them, because a man who has his emotions well under control in his youth will pass into middle-age before you can tell from his expression just how much maturity and strength resides in him.

There are bland-faced lads who seem to have no lines of character at all in their countenances up to about the age of twenty-eight. But when you hear them talk you change your mind very quickly about them, and when they are forty-five the lines are all there, deeply-etched, and the mystery is explained. Commander Littlefield was that kind of man.