Does Birth Order Really Shape Your Personality—or Is That Just Sibling Mythology? | Smartest Year Ever (Apr 10, 2025)

Does your birth order actually influence your personality—or is your older sibling just using it to justify being bossy?

In Episode 100 of Smartest Year Ever, Gordy explores the classic theory that birth order shapes personality. Are firstborns really more responsible? Do youngest siblings actually tend to be rebellious? And what happens to middle children—besides being forgotten at Walmart?

From Alfred Adler’s early theories to modern scientific studies, we dig into whether there’s any real science behind these claims—or if we’ve just been enabling our siblings for years.

Find out:

• Why firstborns might score higher on IQ tests
  

• How youngest kids may have evolved into natural performers
  

• Why middle children could be the true diplomats of the family
  

• And whether the research actually backs any of it up
  

This 100th episode is your perfect chance to settle (or restart) that family debate—with facts.

Sources:

• Rohrer, J. M., Egloff, B., & Schmukle, S. C. (2015). Examining the effects of birth order on personality. Proceedings of the National Academy of Sciences, 112(46), 14224–14229. https://doi.org/10.1073/pnas.1506451112
  

• Salmon, C., & Schumann, K. (2012). The Secret Power of Middle Children. Plume.
  

• Adler, A. (1928). Characteristics of the First, Second and Third Child. Routledge.
  

#BirthOrder #PersonalityScience #SmartestYearEver #DailyFacts #PsychologyFacts Music thanks to Zapsplat.