wise beyond one's years

wise beyond one's years (not comparable)

1. Particularly wise for one's age group; wiser than most others of one's age.
   • 1999, Mona the Vampire, "The Miserable Phantom Dog" (season 1, episode 3a):

     Mrs. Bryerson: Um, aren't you a little young to be contacting the spirit world, dear?

     Mona: I think you'll find I'm wise beyond my years.

• beyond one's years (rare)

• old head on young shoulders

• “wise beyond your years” (US) / “wise beyond your years” (UK) in Macmillan English Dictionary.