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https://www.qfm.bb/2018/10/16/how-fast-will-you-be-running-at-80-scientists-create-a-new-formula-that-tells-you-how-quick-you-can-expect-to-jog-any-distance-as-you-age/
How fast will you be running at 80? Scientists create a new formula that tells you how quick you can expect to jog any distance as you age