Yes. 

And no. 

I tend to avoid them because I hated it in the army. Most of the ma'ams and the sirs were neither deserving of my respect nor even worthy of any consideration EXCEPT their supposedly superior rank. 

I don't mind using it for unknown people of obviously greater age than I. 

Or if I'm playing around with someone I know. 

I hadn't thought about it from the angle of teaching children to be polite. That's another layer that I'll need to ponder. Thank you. ❤️