68 was a number.

In the Shadow World, the President of the United States of America was 68 years old when he died. (TV: Extremis)

According to the Twelfth Doctor's sonic sunglasses during the Monk invasion of 2017, the Secretary General had a resting heart rate of 68BPM, (TV: The Pyramid at the End of the World) as did a member of the Pope's entourage in the Shadow World. (TV: Extremis)

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