geriatric millennial
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
Geriatric Millennial
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!