This is a picture of Bob Dolphin today. Yes, he's the gentleman sitting in the yellow with the flowers. The sign says "Congratulations on your 500th Marathon" That is not a sign-making error. He has run 500 marathons.
He ran his 400th in April of 2007 when he was 77 years old. He didn't run his first marathon until he was over 50 years old. He became a full-time marathoner at the age of 59
He's not just a late bloomer when it comes to running, either. He earned his BA when he was 29 and had already started his family. He went on to earn a PhD when he was 36.