why have I never worndered before?

You probably have wondered and probably already know.

But before just a while ago, I have never in my 70+ years of life, wondered what a.m. and p.m. stand for.

A.m. is ante meridem--before noon. And p.m. is "post..."--after noon.

At least I'm still pondering stuff I've never pondered before.

That's something.

Right?

I hope so.