Again, I brought you new bios, this time of the vampires. I know still there's a lot of doubts/question about this characters so, you could ask at the end of chapter 6… fortunately, it will begin this weekend ^^
If you're confused about the ages of the vampires, just see this example:
Kira is 257 years old, and she looks like a 25 years old woman. This isn't a rule because depends on the behavior of the vampire, but more or less you could figure it out.