Scientists in the Sweden have developed a test that can determine the biological age of a person by comparing the behavior of about 150 genes. The biological age is based on the aging of the body cells while the chronological age is based on the date of birth.
The test was developed by comparing 54000 markers of gene in the body of healthy sedentary 25-65 year olds and then whittling the number of genes to 150 tagged ‘aging signature ‘ genes.  The  test is based on the behavior of these 150 genes.
The researchers believe the test could predict when a person would die and also those likely to develop dementia in future.

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