I soldered one of these with my 6 year old: https://thepihut.com/products/3d-xmas-tree-for-raspberry-pi. They seem to be out of stock, but maybe you can find them somewhere else.

Fun, quick project. With my kid, I healed the iron and they held the solder. I’m guess a 13 year old could do more (or all) themselves.

Then there are options for tweaking the program, like different patterns, a “count down” to Christmas, etc.

There are a lot of these simple soldering projects out there.

Our daughters completed a few. At a minimum, they now know how to solder and have an appreciation for electrical components. That was all I was hoping for at such a young age.

Should either ever decide to study electrical engineering, I feel they will be less intimidated having had this experience.