User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-102.132.250.232-20190902161526/@comment-92.80.248.79-20190927190653

possibly they will find a way to extend their lifespan somehow, vampires and dragons are immortal, and Issei being a god dragon has no age and is practically immortal, so Issei must find a way to make his wives immortal.