Liszt played in public at twelve.

Canova made models in clay while a mere child.

Bacon exposed the defects of Aristotle's philosophy when but sixteen.

Napoleon was at the head of armies when throwing snowballs at Brienne.
All these showed their bent while young, and followed it in active life.

But precocity is not common, and, except in rare cases, we must discover the bias in our natures, and not wait for the proclivity to make itself manifest.