The Surprising Power of the Aging Brain: Scientists used to think intellectual power peaked at age 40. Now they know better.
[8 January 2006 - Time magazine] ... Risk-taking seniors making daring mental leaps? That's not the stereotype. Indeed, until quite recently most researchers believed the human brain followed a fairly predictable developmental arc. It started out protean, gained shape and intellectual muscle as it matured, and reached its peak of power and nimbleness by age 40. After that, the brain began a slow decline, clouding up little by little until, by age 60 or 70, it had lost much of its ability to retain new information and was fumbling with what it had. But that was all right because late-life crankiness had by then made us largely resistant to new ideas anyway.
That, as it turns out, is hooey. More and more, neurologists and psychologists are coming to the conclusion that the brain at midlife--a period increasingly defined as the years from 35 to 65 and even beyond--is a much more elastic, much more supple thing than anyone ever realized. ...