That a true but fairly pointless statement. Humans rarely optimize for learning to the extent that you would hit that hypothetical. It's really quite easy for a 21-year old to know the things the OP is talking about. But A) they don't care to know and B) our education system babies kids.
We could be teaching all this stuff at a far younger age, and many countries do.
We could be teaching all this stuff at a far younger age, and many countries do.