Pat Cardi, who played Homer, was 14 1/2 years old at the time of this episode but it stated that his character was 12 years old.
At about 28 minutes (with commercials) when the eldest son returns to the abandon wagon to get a wheel, you can see Marshal Dillon's and the Army Captain's horses tied up in the brush behind the boy when he's on the wagon. After the boy leaves in fear of the open empty graves, Dillon and the captain ride up to investigate the scene.