14 Signs You’re a Grandma in Your 20s (4) October 14, 2015October 14, 2015 Laura Bellini 3) You’re not really up to date on the new slang. 2) But just because you have grandma tendencies, doesn’t mean you can’t let loose once in a while. 1) And at the end of the day, your friends appreciate having you as the resident grandma.