: The Gems’ desperate attempts to help Steven realize his youth—including Garnet frantically shaking him while crying—eventually help him feel like a child again, reversing the aging process. Reception and Impact
: The title refers both to the multiple parties Steven throws and the many biological ages he experiences in a single day. Steven Universe S1E13 "So Many Birthdays" Recap - TV Tropes [S1E13] So Many Birthdays
: The episode establishes that while Gems do not age and are functionally immortal, they can still be hurt or killed. : The Gems’ desperate attempts to help Steven
: Fans often cite this as a turning point where the series transitioned from a "slice-of-life" cartoon into something with much heavier emotional stakes. [S1E13] So Many Birthdays