Measurement, or the amount measured in years; the length or extent of an abstract amount of time in years.
Example 1:
Eric: "So you gonna apply to that new position posted yesterday?"

Stephen: "Nah, I need to get some yearage under my belt first".

Example 2:
Tony: "Whats going on with the growth on your cheese?"

Lori: "It has yearage...like fine wine".
by Antonio De La Mission May 20, 2011
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