Does Natsu have an known actual age? Whilst looking around the Fairy Tail tag, I was looking again at a question here asked by Shinobu, I finally decided to pop the question "How old is Natsu". I thought it would have been revealed further on in the series, but from the looks of it they haven't although the ages of Lucy, Erza and Gray have been revealed which is as follows


Lucy- 17yrs
Erza- 19yrs 
Gray- 18yrs


Has an age ever been given in the mangas to how old Natsu is?
Well, in chapter 436 it is revealed that, ...


   Natsu is about 400 years old. Give a few years between the flashback  and his birth and take seven years during the time-skip. He was born 400 years ago as the younger brother of Zeref. He died soon thereafter, but his body was kept intact by Zeref during all those years. The body Natsu is using in the current time-line is the exact same as that of Zeref's younger brother. More can be read at this related question about how this all came to be.