The crossword solution for the term 'IT'S JUST A NUMBER, THEY SAY' is AGE, which is a three letter word. AGE is a concept that is used to measure the length of time that someone or something has existed. It is often used to refer to the length of time that a person has been alive, but it can also be used to refer to the amount of time that something has been in existence. AGE is often seen as just a number, and people often say that AGE should not be used to determine someone's worth or value.