Act younger, be younger!
In this study, a group of 75 year-old men entered a residence for an experiment that called for them to act as though they were 55 year olds. The men were surrounded by appropriate props for their younger selves and they played along.
Five days later, low and behold, they emerged looking, feeling and acting younger–compared to the control group of men who had stayed in the present time and were asked to only reminisce of their experiences at age 55.
The key seems to be thinking–and acting–as though you are younger. Get the full story.