When it comes to Hollywood films, and especially films based on historical events, actors are often cast based on whether they're a good fit for a role - and not because they're a similar age to the real life subjects. Movies about war seem to be one of the biggest culprits; soldiers are often portrayed by much older actors than the actual soldiers in those wars. Even when the soldier isn't based on a specific person, their apparent age misrepresents the average soldiers in the wars they are fighting in.
Have you ever found yourself looking at an aging George Clooney or Matthew McConaughey valiantly fighting on a battlefield and thought about how old the actual soldiers of World War I or the Civil War really were? Knowing what the real soldiers' ages were, the ages of actors in war movies may make some of these seemingly accurate films a little less factual.