Via Swarup: BBC News story on the power of thought to stop aging. It's almost entirely about research done in 1979 by Ellen Langer, who has written a recent book on it: Counterclockwise: Mindful Health and The Power of Possibility.
Some of the stuff is pretty amazing:
Pretty soon she could see a difference. Over the days, Prof Langer began to notice that [the 70- and 80-year olds in the experimental group] were walking faster and their confidence had improved. By the final morning one man had even decided he could do without his walking stick.
As they waited for the bus to return them to Boston, Prof Langer asked one of the men if he would like to play a game of catch, within a few minutes it had turned into an impromptu game of "touch" American football.
Langer's blog is here.