The following is taken directly from the article posted at the head of the discussion.
"Now, physicists at the National Institute of Standards and Technology (NIST) have measured this effect at a more down-to-earth scale of 33 centimeters, or about 1 foot, demonstrating, for instance, that you age faster when you stand a couple of steps higher on a staircase."
Just in case you didn't know this, according to relativity, the faster one moves, the slower time passes for you as measured by an outside observer. This means that if the earth was really a sphere, that if you were higher up you would be traveling more quickly (think of a wheel: a point on the inside turns more slowly than a point on the outside) and therefore you would age less slowly! Read the article, it specifically says that the experiment proves that "you age faster when you stand a couple of steps higher on a staircase" and that this happens because the earth is spinning. Nice try scientists, but its rather difficult to create evidence out of thin air.