When a famous preacher reported three and a half souls a saved, people thought it was three adults and one child. He replied it was three children and one adult. A saved child has a whole life to serve the Lord, but a person saved as an adult has far fewer years left for the Lord.
Each one of us can reach children with the gospel, only if would would take a little time. Since as many as eighty percent of the saved ones came to the Lord when they were in their teens, each one of us needs to invest as much time as possible to win them.