I'm awfully partial to The Duke in True Grit, not because of any degree of realism, but because it was one of the last films that he did before age and illness started taking its toll on him. And, as I get older, I can certainly feel a certain sense of self righteousness when faced with a situation that I ought not to be in because I'm too old and fat
You ought to see my father in law when that movie is on TV. He knows the dialog by heart. And he'll sit in his recliner with his Winchester '92 across his lap and cheer Rooster on.
Also, I had a crush on Kim Darby when I was a young 'un.
But, you know, every other movie in this thread is a contender. You guys have good taste!