Can You Date a Photograph?

A photo, probably of George Kenney, head game keeper of Wolston Manor House.
Image courtesy of Paul Kenney

I have a photo that’s probably of my Great Great Grandfather, George Kenney. He was head game keeperat Wolston Manor House. Judging by your historical knowledge, by the look of this photo, the way he’s dressed etc, what sort of decade would you say this was taken?