stodgy
»I often feel sorry for you, having nobody but grown-up people to talk to.»—
»They do get a bit stodgy after a certain age,» agreed the Babe. (Tommy And Co. 164. 16.)
A young gentleman.
Stodgy, probably schoolboy slang, is something heavy, unappetizing, or difficult to digest, lying heavily on the stomach, literally or figuratively: e. g. ill-cooked potatoes, a man whose conversation is all facts and no wit, etc.
Cf. stodge: food, a heavy meal. stodger: a glutton.