Nike has released an advertisement titled 'Unlimited Youth', featuring 86-year-old American nun Madonna Buder. The ad narrates Buder's story, who has run 45 Ironman Triathlons and is nicknamed 'Iron Nun'. Buder ran her first Ironman triathlon at 55, and at 82, became the oldest woman to complete the triathlon, finishing with a record time in the 80-84 age group.