My son just turned 4. He doesnt seem to mind using a keyboard occasionally, though searching for the keys leads to losing his interest quickly. He still finds it amusing typing words in a text editor and seeing them appear on the screen.
Touchscreen seems to be easiest be it for playing games or navigating youtube. He uses google voice quite a bit on an Android smart phone, since he found the "mic" button.
I have a 23-inch touch monitor hooked up to an intel nuc with Win10, which he seems to like a lot. Though the educational apps in windows store are very few. I was not able to find a way to hook up an Android variant to the touch monitor.
My kid only used to be exposed to touch screens. Her daycare then introduced them to more traditional computers with a keyboard and mouse, and they adapted fine.
