old goat

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noun Informal.
  1. an elderly man who is disliked, especially for being mean to or disapproving of younger people.
  2. a lecherous man, especially one considerably older than those to whom he is attracted.

Origin of old goat

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018