Women in their early 20s who have been pregnant are "biologically older" than those who have never been pregnant, and by some measures, this age gap seems to widen in people who have had multiple pregnancies, a new study suggests.
The research, conducted in the Philippines, used various tools to look at people's epigenetics, meaning the chemical tags attached to their DNA. These tags don't change the DNA's underlying code but rather help control which genes are activated and to what degree. The new study specifically looked at methyl groups, a type of molecule long linked to different aspects of the aging process.
