coming of age: noun. [ s ] : period of time when someone attains prominence, respectability, recognition, and maturity, at an emotional, mental, and/or physical way. OR : the act or instance of reaching maturity. in which a young college drop out decides to move across the country to start a new life and stumbles upon someone who seemingly has it all figured out. STARTED: OCTOBER 29, 2020 all rights reserved.©️ tobi.