Sorry, younger siblings. On standard measures of success, first-borns do better. But the reason why might have more to do with germs than personality https://www.economist.com/graphic-detail/2026/04/16/why-eldest-siblings-are-brainier?taid=69e35f82ba4ee50001ee12be&utm_campaign=trueanthem&utm_medium=social&utm_source=voante
