The crossword solution for the term 'MAKE YOUNG' is SIRE, which is a four-letter word. The term 'SIRE' is used to refer to a male parent of an animal, usually a stallion or bull, or to a man who is a father or ancestor. It can also be used to refer to a man who is considered to be the founder or creator of something. In this context, it could be used to refer to someone who makes something YOUNG again, such as restoring an old car or reviving a dying business.