All that I can say so far about the dating of Satan's World is that its events occur shortly before the first part of "Lodestar," therefore when Falkayn is thirty two or thirty three. There must also be some relationship to van Rijn's age. That individual says in Mirkheim, Prologue, Y minus 9, that he is thirty years older than Falkayn. (Rise Of The Terran Empire, p. 17) Accordingly, Sandra Miesel's Chronology has van Rijn born in 2376 and Falkayn in 2406 whereas Sean M Brooks gives 2421 and 2451, respectively. We can see that the thirty year difference is consistent with the text of Mirkheim but not necessarily why any particular year dates are specified.
Meanwhile, while rereading a text for clues about characters' ages, we also enjoy other details. The Ikranankans ride not quadrupeds but large, leaping bipeds, I suppose like kangaroos. That is the sort of imaginative difference that we expect from a creative sf writer. This book cover shows Adzel carrying Falkayn who is shooting at a lance-wielding Ikranankan riding a zandara. The Ikranankans are too far away for us to discern their beaks, ruffs or corvine beaks.