Shaking hands can reveal true age: study
A person's true age can be discovered simply by shaking hands, researchers claim.
Scientists found hand-grip strength correlated with known markers of ageing, such as disability, mental decline and recovery time after hospital treatment.
They believe a 'handshake test' could be used as a viable test for biological age.
"Hand-grip strength is easily measured and data on hand-grip strength now can be found in many of the most important surveys on ageing worldwide," said Dr Warren Sanderson, a member of the team from the International Institute for Applied Systems Analysis (IIASA) in Austria.
The research, published in the online journal, Public Library of Science ONE, reviewed findings from more than 50 studies looking at people of all ages from around the world. It found that higher grip strength corresponded with indicators of younger biological age in different population groups.
Previous research has shown simply measuring the number of years people have lived does not provide an accurate picture of biologically how old they are.