They loved them as children, and apparently there are some young adults who still like stickers.
"Adulting Calendars" are available on Amazon for the Millennial looking to self-congratulate life's minor accomplishments, things like "I didn't kill my plants!" or "I didn't tell my boss off."
The "I Adulted" calendar is the brain-child of associate publisher Robb Pearlman, a Trekkie with a penchant for jokes and humor.
If the millennial in your life is struggling with adulthood, you can share insight from Audiopedia on You Tube, "Stupidity is a lack of intelligence, understanding, reason, wit or sense."