The crossword solution for the term APPROACHES 100 is AGES, which is a four-letter word. AGES is a noun that refers to the length of time that something or someone has existed. It is often used to refer to the amount of time a person has been alive, but it can also refer to the amount of time something has been in existence. In this context, it is likely referring to the amount of time something has been around, such as a certain technology or idea.