What an absolutely wonderful old photo! Definitely 1860s, and I think early. Actually a typical 1850s pose, but not taken during that decade as photos printed on paper didn't come along until about 1860/61. And not a paper print made from an earlier glass photo, unless the print had been flipped because glass photos were backwards.
Both men are wearing a popular beard style called a Newgate Frill. You are very lucky to have such a fantastic old photo! Both men are very handsome

Cheers,
China