Q: Pages '09 (4.3) with Sierra?

There are at least two threads on this subject in this forum. In both of them I have said the following:

I've been using Pages 4.3 & Numbers 2.3 without issue in Sierra for a couple of months.

You did the right thing. You came here, and got the facts from those with the real knowledge.

I can also mention that Pages '09 v4.3 works for me on macOS Sierra, too.

I have replied to that list that Pages 4.3 & Numbers 2.3 have been working without issues for me in my everyday use in Sierra for at least the last two months.