Two Spaces after a Period?

At work, I am on a team that reviews, updates and writes policy for our nationwide program. We had this conversation a couple of years ago. A lot of strong opinions back and forth, but apparently the two spaces after a period has been dead for many years. I believe that all modern writing style guides call for one space.

I am 51 this year and it hasn't been a difficult transition for me. But there are still holdouts, for sure.