A study of people born within a year of each other has uncovered a huge gulf in the speed at which their bodies age.
The report, in Proceedings of the National Academy of Sciences, tracked traits such as weight, kidney function and gum health.
Some of the 38-year-olds were ageing so badly that their “biological age” was on the cusp of retirement.
The team said the next step was to discover what was affecting the pace of ageing.
The international research group followed 954 people from the same town in New Zealand who were all born in 1972-73.
– The BBC