According to a new study Published by the BBC,  the aging rates vary widely.

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 analysis showed that at the age of 38, the people's biological ages ranged from the late-20s to those who were nearly 60.