1 definition by joel b from oou

a physical quality that entails unforeseen strength of an individual, including unexpected techniques based off of life experiance, and the ability to conquer others based on having more age age than them.
Joel: a twenty five year old male, with grey hair and a flabby body, on unemployment, who undeniably beats others at arm wrestling ( beats others who have a much better physique ) because of his past experiences with dirty manly jobs.
"He only won because of his 'old man strength'"
"thats cheating - thats 'old man strength'"
by joel b from oou November 3, 2007
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