I found a lovely photo of Thomas Stokes (founder of Stokes & Sons) and his wife, Ellen, in the website http://heritage.darebinlibraries.vic.gov.au/
Thomas and Ellen Stokes. According to the website, this photo dates c.1880s. This is probably incorrect, as that would date Thomas only in his fifties. I would hazard that it was taken in the 1900s by his white beard and hair. His hair was dark when he was younger (see the Stokes page).