Cancer Survivor Completes Marathon at Age 92

Harriette Thompson breaks a record as the oldest person to complete a marathon.
1:25 | 06/02/15

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Transcript for Cancer Survivor Completes Marathon at Age 92
Finally tonight here, America strong. And one photo finish. Take a close look at this photo. Harriet and sid of Charlotte, North Carolina, and what a life. Parents to five, grandparents to ten. She began running in her 1970s. Her first marathon at 76. And this weekend, her hand to her heart, about to do it again at 92. There's Harriet. A two-time cancer survivor. Her 16th marathon. This one in San Diego. Seven hours, 24 minutes later -- Holy moly! Harriet! Reporter: How are you feeling? I feel wonderful. Reporter: She set a new world record. The oldest woman to complete a marathon. It's nice to have a world record. But that wasn't my main goal. Reporter: You got through 26 miles, 385 yards. Is that what it is? Reporter: It is. I mean, I'm lucky if I can get through ten minutes on the treadmill. I'm glad I didn't have to count that when I was running. Reporter: She told me what she was doings was playing music in her head. Harriet has played at Carnegie recital hall three times and playing her most difficult pieces to get her through the marathon. I think you have to be feeling -- you can do it, and just keep saying that to

This transcript has been automatically generated and may not be 100% accurate.

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