Agreed. OP said they don't know Lua, but if you know Javascript it can be picked up in a day or two. And it's really a lovely experience.

I started coding on my teens and I was using Turbo Pascal and later Borland C with BGI. Lua/Love2d is even easier to pickup than Pascal/C/BGI was, and has way better documentation.

I think 11y/o is a great age to start writing code! (or, tbh, as soon as you have learned to read and write and some basic arithmetic :-).