By Dr. Liji Thomas, MD Reviewed by Benedette Cuffari, M.Sc. Apr 29 2025 Research finds that while excess stored iron may speed up aging through oxidative stress, higher blood iron and transferrin saturation are associated with slower epigenetic aging. Study:  Association Between Body Iron Status and Biological Aging. Image Credit: Anas Sarfraz / Shutterstock.com A recent study published in Nutrients examines the role of blood iron levels in DNA methylation-based measurements of biological aging.