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An alternative explanation for the date on disappearing left-handers is that the older left-handers have become right-handers because of social pressure.
As a result, they may have been forced by their parents and teachers to become right-handed.
Now, of course, society is more permissive about left-handness, which has led to an increase in the number of left-handers.
Thus, the small number of older left-handers might be due to the fact that the older people had had their left-handedne...
