Ninety-seven healthy girls, ages 10 to 14, had saliva DNA samples taken. About half of them had moms with histories of depression, and about half had moms who did not. None of the girls had histories of depression. (1)The girls whose moms had suffered depression had significant reductions in the length of their telomeres. We all want to understand telomeres, the caps at the ends of our DNA strands, because the longer they are the longer we tend to live — and live freer of age related illnesses like heart disease, stroke, dementia, diabetes and osteoporosis. The girls whose moms didn’t have histories of depression, the control group of the study, did not show the same changes in their DNA as a result of reductions in the length of their telomeres.