When you feel that doing the same shit over and over for years is too much to deal with anymore.
Example 1:

Mom: Junior wet the bed again.
Dad: He's ten years old. Fuck, i'm too old for this shit.

Example 2:

Friend 1: What's 1+1=?
Friend 2: I'm too old for this shit.
by Bhursty1180 January 20, 2015
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