Telomeres are DNA fragments whose length is very long at birth and then becomes shorter and is regarded as a sign of aging. After analyzing data over the years, the researchers found that the average telomere length of women who had at least one child was 4.2% shorter than that of infertile women. This percentage is equivalent to 11 years of cell aging, outpacing the effects of smoking and obesity on cell aging. As a result, it has been suggested that having children will speed up the aging of women.
The statement 'During pregnancy, the level of estrogen in women continues to rise sharply, which has a protective effect on cell telomeres' cannot refute the above point of view if it is true.