The term 21, MAYBE is composed of two crossword solutions: LEGAL (5 letters) and LEGALAGE (8 letters). LEGAL is an adjective that refers to something that is in accordance with the law. LEGALAGE is a noun that refers to the age at which a person is legally allowed to do certain activities, such as voting or drinking alcohol. In many countries, the LEGAL age is 21, which is why this term could be interpreted as 'maybe 21'.