working with Microsoft Office 2010 for Mac

I'm an author working in Office for Mac 2010. I do not want to upgrade and currently have the Sierra OS. How high can I go before I can no longer use my 2010 Word program? I'm afraid I've reached the latest one that will work.

Version MAC OS SIERRA 10.12.6 Purchased new March 2014 I love my mac, and I'm comfortable working in my 2010 version of Word for Mac. As an author who started writing for NY on an IBM selectric, the idea of learning new programs in my 70s is not something I want to do, hence the reason I want to know the newest version of Mac that will still work with my Microsoft for Mac programs.

Thank you!

Kate Douglas