The crossword solution for the term ADD YEARS is AGE, which is a three-letter word. AGE is a measure of time that is used to describe how long something or someone has been alive or in existence. It is often used to refer to the length of time a person has been alive, but it can also be used to refer to the amount of time something has been around. Adding years to AGE is a way to measure the passage of time and can be used to compare different ages.