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A geriatric millennial is a millennial on the cusp. The oldest breed of millennial out there but still acts like a true millennial.
I'm 36 years old, they call me a geriatric millennial
by DarleneOliviaPope June 11, 2017
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A person who is young but acts beyond his years.
My girlfriend is 20, but she’s got her shit together and she likes to knit; she’s such a geriatric millennial!
by El Jeffe 84 January 19, 2018
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