> A particularly terrible language is Chinese where most old people can't type the characters even though they can type Latin letters. That's because you have to deliberately invest time to sit down and learn an input method which is a non-trivial endeavor that takes weeks of effort and old people just aren't going to go back to school for that.

Is that your personal experience? Most input methods I know work by 1. knowing the Pinyin romanization of the word you want to type 2. typing it in 3. selecting the appropriate characters from a long list of candidates.

If they know the characters and Latin letters, then the only roadblock I can think of would be not knowing Pinyin. That shouldn't take weeks to learn if you already know Chinese, it's more like learning a very simple alphabet.