Key points from article :
Shorter telomeres are associated with chronic diseases, high-stress levels can affect to the shortening.
Telomere length is regarded as a marker for the biological age of a person.
It's unclear if telomere elongation reflects any improvement in a person's health and ageing trajectory.
Participants of the study underwent 4 MRI examinations every 3 months, provided blood samples on the same dates.
Scientists were able to determine telomere length using a polymerase chain reaction.
The study was published in JAMA Network Open.
