I guess I got through that when I was 7 on a pass-me-down ZX81 from a relative who just had upgraded to a Spectrum (I assume).
I mentally called bull when reading boragonul's story because:
a) BASIC has a REPL
b) Kids back then had near infinite patience/time.
c) These computers came with pretty good manuals explaining BASIC
There was very little external stimuli. As an example: TV broadcasters in Europe were literally mostly shut off during the day to save power. Radio was on all day, but it was 99% boring adult stuff.