User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-185.112.105.215-20191022145950/@comment-2208155-20191022150936

We are 1 year 6 months before Issei was transformed into devil.

They have '''only some weeks or like 2 months... Hades obtained Lilith after '''Rizevim defear(vol 23)

Seems that Lilith Children born and in few time(weeks or months) they are adult.. Probably it was always like that or GOH accelerated their growing.