Biological "aortic age" of the heart reduced by approximately four years in first-time marathon runners.
“Post-training measures revealed that training reduced systolic and diastolic aortic blood pressures by 4 mm Hg and 3 mm Hg, respectively, translating to approximately four years of chronological age. Men and older marathon runners saw the greatest improvements in their cardiovascular health, compared to younger or female runners. Link to study abstract.”