The very first Probability Zero story in Astounding took us on a romp back in time by the members of the Drinkwhiskey Institute to obtain saleable specimens of Pleistocene fauna, where we learn that time travel has an effect on aging (coincidentally, the same effect described by Gaspar in Chapter 9 of El Anacronópete).
A curious feature of time travel back from the present is that one gets younger and younger, becoming successively a youth, a child, an embryo and finally nothing at all.

Tags

(1)

Variants

(1)
  1. “Some Curious Effects of Time Travel” by L. Sprague de Camp, Astounding, April 1942.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by L. Sprague de Camp