> They're 13.

So? It's 13 years, not months. They're perfectly capable of learning that stuff by now.

> Making apps is so complicated now

I haven't noticed. Why do you think it's so complicated? Making things with GTK, Qt, PHP etc. seems even easier now than it was two decades ago when I was 13 and learning this stuff. Browsers are picky with JavaScript from local files, but these days you can just launch a HTML file with Electron. There's even Lazarus if we wanted to closely replicate what I was learning with back then.