I read on this site years ago that sometimes a family would years later, have a reprint from the original photographer... the careless extra wide border on one side made me think this, But now have to dismiss this.
I had the old gent down in my mind as John Isaac from High Bickington, Chagford Devon born 1822 - died 1902 age 79.
But now if it is a later photograph the contender has to be John Scott Ellis born 1849 - died 1929 age 80... the old chaps suit threw me... but I suppose people hung onto anything that hadn't worn out.
On the plus side the younger man is possibly my Grandfather Charles Guy Bradley who I've never seen born 1874 and died 1926.