Another study, which researched elderly meditators, was published in the Journal of Personality and Social Psychology 57(6): 950-964, (1989). It reported that people in their eighties showed a marked improvement rather than deterioration in their mental and physical health and well-being over a three year period of practicing Transcendental Meditation. Benefits for the meditating elderly included: reversal of aging; increased longevity; increased cognitive flexibility (including increased learning ability and greater perceptual flexibility); increased word fluency; improvements in self-reported measures of behavioral flexibility and aging; greater sense of well-being; improved mental health; and reduction of blood pressure to more ideal levels.
Perhaps research done on long-term meditators provides a hint. According to a study published in the International Journal of Neuroscience 16 (1): 5358, 1982, the longer people had been meditating the lower their biological age became as compared with their chronological age (as measured by blood pressure, and visual and auditory performance). As a group, long-term meditators who had been practicing the Transcendental Meditation technique for more than 5 years were physiologically 12 years younger than their chronological age. Short-term Transcendental Meditators were physiologically 5 years younger than their chronological age. The study controlled for the effects of diet and exercise