Scans reveal the brain's early growth, late decline and surprising variability

I'm 58; dunno if I want to click through... Probably too depressing. :-(

See also: https://news.ycombinator.com/item?id=30942921 , https://news.ycombinator.com/item?id=30943370

(And, more tangentially: https://news.ycombinator.com/item?id=30920287 )