Copy files except when destination modified in last x days

I think what I am trying to do is simple, but I can’t get the robocopy settings right, as I am trying to copy files from src to dest, over-writing files in dest if they already exist, except if modified in the past 7 days.

• /minage:7 seems to not copy files if they were modified on the src instead of what I want [dest], unless I am missing something.

How do I accomplish this?