Thread:B214/@comment-30100337-20170615155045

on a lot of the character pages, they say what age there is. but that would be speculation. the only age we do have confirmed is Issei's, which is stated he is 17 in volume 8 life. 5 part 3 by matsuda. by the time volume 22 happens, Issei will now be 18 because Issei's birthday is april 16th and the end of 22 is the later half of april.

but there are some characters that have birthdays that are based off of speculation. for example Ravel Phenex (best girl). on her page, it says that she is 17 years old. I removed this because her age is not confirmed. I was then questioned by Binna lover and he said that it was confirmed. I said please show me where it is "confirmed" otherwise it is speculation. not everyone is the same age when they enter a grade. in volume 9 New Life part 2 they say "Ravel should be a first year". this does not mean that she is automatically 16. it is "speculated" that she is around 15-16 but it is not "confirmed". also just because she became a 2nd year does not mean she automatically aged a year. so let's say that Ravel did join the first year when she was "16", Volume 22 (the most translated volume as of now) takes place in April. Ravel's birthday is in June. So not only has her birthday has not happened yet, she would not all of a sudden be 17 because she went from first year to second year.

so even if Ravel joined while she was 16 she would still be 16 by the furthest point in the story. only Issei's age is known and we know that Rias is a year older than him. This also goes for Koneko since it says that she is 17 but there is no confirmed age for her anywhere in the light novels. also, all of the other characters that have ages like venelana where it says that she is over 1000 years old is just speculated and is never mentioned  