User blog comment:Bennia Lover/Age of Characters/@comment-31137559-20170508183758

Azazel calling Sirzechs young is like a 60-year old calling someone in their mid-20s young. He wasn't saying that Sirzechs wasn't an adult, but compared to beings that live for thousands of years, he's remarkably young. Especially considering that he was Lucifer. Because if you're only considered an adult as a devil wben you're 1000 years old then nearly all the devils that participate in the Rating Games wouldn't be able to.

And Issei and the others are 17 at the current moment. High School DxD doesn't consider birthdays. Or else it would have been noted that Rias was 18 and Issei was 17 at the beginning of the series since it started in April. When was the last time you've heard a birthday mentioned? And most people graduate in the year they turn 18. Their ages are going off what year in school they're in and what age they would be regardless of where their birthdays fall. And Volume 19 started off the new year automatically making them a year older regardless of when their birthday actually was. First year high school students would be 15 at the start of school. Second years would be 16 at the start. And third years would be 17 at the start.

And Rossweisse is 18/19 at the current moment. It was stated that she was the same age or a year older than Rias and Rias had originally asked her if she had wanted to be a student at Kuoh Academy. She matured faster than normal and did normal things an adult would do as a teenager. And there are countries in the world where the drinking age is lower than 21. And Rossweisse did that on an impulse so rules be damned. And Valerie, Dulio, Tobio, and Lavinia are 20 at the current moment in the series. And Kunou is 12 at the current moment due to her starting her first year of middle school. So is Tosca(physically).