User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-201.233.75.19-20170817214938/@comment-30924344-20170818002253

“Hmm, it’s been what, tens, no maybe hundreds of thousands of years since a real battle. Hahahaha, it’s quite entertaining. Ah gomo gomo.”

So Zeoticus is over hundreds of thousands year old