Thanks! Yeah, early 1900s-1910s was our best guess, which means they probably can't be who my aunt thought they were, which is her grandmother's parents, as they were born 1865/7 and would have been in their 30s-40s by the 1900s. This couple look a bit too young. Unless they were just really well preserved? It's so hard to be sure! Especially since there really aren't that many other possibilities for them, given which branches of the family have photos of them.

Genealogy is like being a detective!