Younger siblings are significantly more likely to become professional athletes. The elite athletes had 1.04 older siblings on average; non-elite siblings had only 0.6 older siblings. Older siblings who routinely beat their younger siblings are not pushed in the same way. Playing cricket or rugby with their younger siblings, older siblings will be able to lean on their physical advantages to win. An older sibling can be a champion, just as a younger sibling can be a sporting dud.

Source: New Zealand Herald January 16, 2021 19:07 UTC