How old is Jill valentine

considering these facts i found out these are the characters current ages.

1996 - resident evil 1
chris redfield - 23
Jill valentine - 23
albert wesker - 38
barry Burton - 39
billy coehn - 25
rebecca chambers - 18

1997- resident evil 2
leon s.Kennedy - 22
Claire redfield - 21

so by resident evil 5
Chris Redfield is 35
Jill Valentine is 35
Albert Wesker is 48
Barry Burton is 49
Bill Coehn is 38
Rebecca Chambers is 30
Leon Kennedy is 34
Claire Redfield is 33