Chronologically an adult, emotionally still waiting for summer break.
Overview
Your body may have aged but your soul never left the group chat. You run on snacks, inside jokes, and the unshakable belief that bedtime is merely a suggestion. Responsibilities exist somewhere in your peripheral vision, politely ignored. You feel everything at maximum volume, recover in about twelve minutes, and immediately chase whatever looks fun next. Consequences are a future-you problem, and future-you is also sixteen. It is chaotic and exhausting and, honestly, it keeps you young.
Telltale signs
Wait, is this based on anything?
Loosely, yes. Each answer leans on real psychology: how old you feel (subjective age), the way most people mellow with age (the maturity principle), and what we chase when time feels long versus short (socioemotional selectivity theory). The phrase mental age itself comes from Alfred Binet’s early intelligence work. We then mash it all into one cheerful verdict that is absolutely not a diagnosis.