Dr. Wallace was one of the first scientists to study the effects of meditation on ageing, published for the first time in 1982. He found that when a group of researchers measured biological age (how old a person is physiologically rather than chronologically), determinants of blood pressure, vision and hearing were all improved for age with meditation.
Those practising meditation for five years were physiologically 12 years younger than their non-meditating counterparts. Even the short- term participants were physiologically five years younger than the controls. Several of the subjects in the study were found to have a biological age 27 years younger than their chronological age. This study has since been replicated several times. Long term and regular meditators typically look younger than their years.
Reference: Wallace et al., 1982, International Journal of Neuroscience