Older Dads May Produce Offspring With Long Lives

Older Dads May Produce Offspring With Long Lives

Mike Phelan gives son, Aiden, three-months-old, a peck on the cheek after finishing the race together in downtown Fort Collins, Colorado. Aiden rode in a jogging stroller as Phelan pushed him through the course. (AP Photo/ Fort Collins Coloradoan, Rich Abrahamson)