Key points from article :
Cell-free DNA (cfDNA) can reflect differences in the age and health of individuals.
Cell-free DNA (cfDNA) refers to naked DNA fragments that occur within the bloodstream.
cfDNA was taken from groups in their twenties, seventies and those over 100 years of age.
The eldest group was further subdivided into healthy and unhealthy individuals.
Nucleosome spacing of cfDNA differed depending on age and health status.
Spacing was regular in 20s group, but deteriorated with age.
Healthy aging results in epigenomic characteristics similar to those of younger individuals.
The study was published in the journal Aging Cell.
