Fauja Singh, at the age of 102, was believed to be the world's oldest runner as of October 11, 2013. He began running at age 89 and completed nine full marathons before retiring from competitive racing in February 2013 after a 10K race in Hong Kong. Even after retirement, he continued his daily jogging routine in east London.
This information is based on a news article from October 11, 2013, stating that at that time, he was considered the oldest. It's important to note that records for the oldest runner are constantly evolving, and newer individuals may have surpassed this record since then. Therefore, this answer reflects the information available at the time of the referenced article.
