From India, “Victims of Time” written and translated by B. Sridhar Rao, M.D. It’s a three-page mashup of D.O.A. and The Curious Case of Benjamin Button. A scientist reverses the aging process, curing those with debilitating health conditions like the protagonist. But when it’s realized the human race will become extinct in a single lifetime, the scientist reverses the process again and our protagonist finds himself writing his story as each sentence brings him closer to the end.
The story was included in The Penguin World Omnibus of Science Fiction edited by Brian Aldiss with Sam J. Lundwall (1986).