By the age of 19, he had made his first $1 million.
By the age of 21, she had her first child.
By the age of 17 he had three people working for him.
His first film role came by the age of six, in 1930.
By the age of 16, he was on his own.
By the age of 23 he had set up his own building company.
By the age of 15 he had lost both his parents.
By the age of 15, he was living on his own.
By the age of 14 both his parents had died.
He became a full professor by the age of 30.