The term 'YOUNG LICE' can be broken down into two words: 'NITS' and 'YOUNG'. NITS is a four-letter word that refers to the eggs of lice, which are small parasitic insects that feed on human blood. The eggs, or nits, are laid by female lice and are usually found in the hair of humans, particularly YOUNG children. The second word, 'YOUNG', refers to the age of the lice, which are typically immature and not yet capable of reproducing. Therefore, the term 'YOUNG LICE' refers to immature lice that have not yet laid eggs.