I very much doubt the "not a technical part" but. If I hand a USB stick with "any mainstream Linux" to my dad (75), he'll plug it in and nothing will happen. Why? Because my dad does not know about boot order, boot loaders, BIOS, efi, or any of that. If he should by some miracle manage to get the stick to boot, how do you expect he'll get past the partition screen without losing all his data?
The answer is: he's not. He does not even know what a partition is.
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