How long have the Hawks existed?

 DC's 20 Oldest Heroes, Ranked By Age

CBR put out a ranking of the top 20 oldest DC heroes, and both Hawkman and Hawkwoman are on the list. Hawkman's first life as General Ktar of the Deathbringers and Hawkwoman's first life as Shrra the Herald. It's impossible to know when they first came into existence. They both lived an incredibly long time before their reincarnation cycle of thousands of lives even began. 
 Hawkman is listed at No. 12. He appears to have been created by the Lord of the Void for the purpose of conquering planets and as Hawkman Vol. V No. 7 (February 2019) indicates, Ktar was alive and active for a very long time before he finally broke free of the Lord of the Void's control with Shrra's help/ My guess would be at least 100,000 years old but it could be even longer than that. 
 Hawkwoman comes in at No. 6 as she is probably even older. The fact that she was a herald of the god entity that appears in the issue mentioned above would indicate that she was created at the beginning of this god's existence.  
 There is no doubt that Hawkman and Hawkwoman have been arround for an extremely long time. Their knowledge of history and their expertise gathered from their previous lives is criminally underused by DC Comics writers. It would be a fascinating subject to explore and it would set the Hawks apart from most DC characters. 
 It appears that they sometimes forget some of their past lives until they come across a place or an artifact that triggers their memories and helps them remember. In Hawkman's very first appearance in Flash Comics No. 1 (January 1940), Gardner Fox set this up beautifully with the Nth metal knife that caused Carter Hall to remember his life as Prince Khufu of Egypt. Robert Venditti used the same method to help Hawkman rememeber his past lives on Krypton and other places. This would be an interesting thread for a writer to tackle someday. Even a TV show that introduces a different memory trigger each week would be very interesting. The possibilities are countless. 
 What do you think? How long do you think the Hawks have existed? Let us know what you think in the comments!