WordReference Random House Unabridged Dictionary of American English © 2017
old boy  (ōld boi for 1, 2; ōld boi′ for 3;
ōld′ boi for 4),USA pronunciation
  • Informal Terms(sometimes disparaging). an adult male, esp. a Southerner. Cf.  good old boy. 
  • a lively elderly man.
  • British Terms[Chiefly Brit.]an alumnus, esp. of a boys' preparatory or public school.
  • British Terms[Chiefly Brit.]See  old chap. 
    • 1595–1605

    Collins Concise English Dictionary © HarperCollins Publishers::

    old boy n
    1. (sometimes capitals) Brit a male ex-pupil of a school
    2. informal chiefly Brit a familiar name used to refer to a man
    3. an old man

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