User blog comment:Sakuya156/Has anyone?/@comment-4725812-20120102211849/@comment-4725484-20120102235237

Yes, besides purebloods, vampires will age. Former-human vampires age as normal humans do, I believe, while Level-C vampires and Aristocrats hve a slower mortality rate (but still age). That is why in Chapter 46, Zero says to Yuki "Go Yuki... go be next to... the man who can spend eternity with you." He is referring to the fact that he cannot live forever along with Yuki. Sad, but true.