I think the ease of teaching yourself coding correlates directly with your age when you learn it. A survey of my peers has shown:
Obviously that's not scientific -- I had about 70 data points total, and I didn't make any special efforts to eliminate bias -- but anecdotally, it is interesting.
Also anecdotally, I taught myself to code at a very young age (very slowly from 5-8, and then diving headlong into it at 8) and I don't remember it being hard -- at the time, I thought learning it was easier than learning my letters.
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