I guess it is because they were raised 의해 용 who probably did not care of their age and the dragon slayers too forgot about them after being raised 의해 those dragons. :) I hope 당신 like my answer !!! :)
posted over a year ago
well.... maybe that's one of the reason. I wonder how old Natsu is
I believe it is possible that there is 더 많이 to this than we think. It's very possible that they are much older yet they don't know it. Remember at the beginning of the 너바나 arc how Natsu recognized Wendy? He never met her before, let alone seen her. It's also interesting how Zeref knew Natsu, but it could be something to do with a prophecy 또는 something. I think there is a lot of mystery surrounding this 질문 and that's exactly how Hiro Mashima wants it.
Well I guess u could say he's just a little younger than Lucy but take into account acnologia he was a dragon slayer but has lived for 100s of years so maybe they don't worry about age because they could live as long as the ancient dragon slayer art