In the third episode of , "[S1E3] Dick's First Birthday " (originally aired January 23, 1996), the Solomon family confronts the human obsession with age. What begins as a bureaucratic request from Nina for Dick’s date of birth spirals into a comedic exploration of a middle-life crisis as the aliens learn that humans don't just exist; they "age". Plot Breakdown

"3rd Rock from the Sun" Dick's First Birthday (TV Episode 1996) - Trivia - IMDb

: Nina’s request for a birthday list forces the Solomons to quantify their time on Earth. Dick arbitrarily chooses the age of 45, while the others are content with their respective human vessel ages.

: The episode ends on a rare moment of connection between Dick and Mary when they both realize they are 42 years old (though John Lithgow and Jane Curtin were both older in reality). Production Trivia

: Dick becomes offended when Mary Albright gives him a teasing birthday card mentioning he looks "old and wrinkled". His insecurity is compounded by his attraction to a young anthropology student, Laurie, played by guest star Lauren Graham in one of her early roles.