The old bloke introducing sounds like he is English 
Strange to think that Amercian Civil war people were still alive and were filmed.
And Ex - Slaves were still alive as well in the 1900's etc
The average age of a serving soldier in the South was around 20. There were even drummers, buglers, who were allowed to serve down to age 10 or so...but mostly 12 or so. Average age of a Brigadier General was 33 (One General was 12 when he was "Breveted" General, but that's another story). Lt. Generals (3 Star) averaged 55 in the CSA, and that number fluctuated greatly after Shiloh and the loss of generals in combat. So it's very easy to see where a "veteran" of the CSA could very well be alive and well in 1913 in the far early days of talking movies, albeit with many of them with long gray beards and a cane in hand.
On one side of my family both GGGGrandfathers survived the war. My mother remembers very distinctly her GGGrandmother in her final years telling her that she had better settle down and act better or she would "hit her with her sheleighly" in perfect Irish accent. And she had been born in America by Irish immigrants.