08/27/2026
There's probably a sibling in your life you'd call close, even though your last real conversation was months ago.
A team of researchers spent more than 60 years finding out whether that matters. They followed over 10,000 people from the day they graduated high school together in 1957, checking back in again and again until the group reached their early eighties.
Here's the twist: feeling emotionally close to a sibling did not predict a sharper mind decades later. Staying in actual contact, the calls and the visits, did.
Full breakdown in the comments.