What age did you started teaching your kids a programming language? And what language is that?

Well JS of course. I'll read them source code from day 1.

JS and from around 10 or 11 when they started to show an interest

I run a code club at my kids school. He was 10 and we started with stuff like scratch then did some html/CSS and then did python.
The stuff here is very good for kids:
https://projects.raspberrypi.org/en...

@dan-pud thanks, forgot about scratch that they also tried.

Kids started learning scratch at 7.

They're not overly interested yet in the coding side but they like making things move and blowing up with it.

@C0D4 not to mention making noise! 😆

I have no kids, but I've been one, so I hope my experience enters in the scope of your question:

They were 90's, and slightly before PC came to home of people no were really into tech world.

I was 7 when my father teach me to program his old programable calculator. I think it was the Casio FX-702P. He also provide me some paper pages with example code of programs.
I made some stuff there.
He only allowed me to write on the calculator if previously I wrote the code by hand on a paper. I think it was a very good decision.

Some time later (a year?) my father teach me the very basics of QBasic. From there on, I got no more teaching.
I went into a circle of make a lot of things with the only technical knowledge I had and spend hours reading documentation to learn new things that made me able to made new things.

After some years of that, the last intervention of my father: he provide me a printed book of visual basic, in my mother tongue.

Then, earlies 00's, I went into JS

C++ at the 3rd grade, Pascal at the 4th, and Python in the 6th grade.