
Isn't there a policy
against dating GRADUATE students?
The Big Bang Theory Season 2, Episode 6

Graduate schools should do a better job
of screening those people out.
The Big Bang Theory Season 2, Episode 2

Don't worry. I've kept them all
at a high-school GRADUATE reading level.
The Big Bang Theory Season 2, Episode 13

...as a lowly GRADUATE student.
The Big Bang Theory Season 2, Episode 6

Not bad.
I myself started GRADUATE school at 14.
The Big Bang Theory Season 1, Episode 12