Portugal

No one is going to behead you if you get the ages wrong for some reason.

But as you said, it’s only done in very very formal situations. Usually army/navy/airforce dinners and such. You almost never see it anywhere else.

I feel like this is a global thing but here it goes When serving dinner the women are served first, then the men. They do this from oldest to youngest.

So, first person to get food/wine/water/wtv served is the oldest woman, and the last person to be served is the youngest man…

Edit: I got the tittle wrong I thought it was only formal setting stuff. This is only done in very formal settings. Like an extremely important ceremony on the military branches of my country for instance.