Database

In Poul Anderson's The Stars Are Also Fire, chapters entitled "The Mother of the Moon" are flashbacks to the long life of Dagny Beynac followed by the short career of her download. In Anderson's Harvest Of Stars, chapters entitled "Database" are about the second download Guthrie, the one that went to Alpha Centauri and returned. The first of these "Database" chapters is set in the narrative present of the novel whereas the second is a flashback to his time on the Centaurian planet, Demeter, and includes a memory from the time before he left the Solar System.

Guthrie was born in 1970. He must have founded Fireball, been downloaded and died in the twenty first century. Dagny must have lived into the twenty second century. Harvest Of Stars is set two centuries after the founding of Fireball and The Stars Are Also Fire another two centuries after that (I think). So far, 1970 is the only definite date mentioned.

Wells' Philip Raven, Heinlein's Lazarus Long, Asimov's Susan Calvin, Blish's Adolph Haertel and Niven's Lucas Garner were born in the twentieth century. The future always starts now.