how old is natsu dragneel???!!!!!

No one knows. It's part of the plot... Hehehe manga readers will understand and soon the Anime only fan will too. :) Remember the Battle of Fairy Tail arc. There was an enchantment placed da Freed so that anyone that were stone statues o were over the age of 80 years could not leave the guild building. Makarov, being over 80 couldn't leave but neither could the dragon slayers... Something for Anime only fan to think about. :)
Some più proof from the manga. Hiro did 'guild cards' for a few of the character at the beginning of Fairy Tail. If te want to check to see if I'm truthful then the site kissmanga has it, just look at chapter 23. Here is Natsu's: (It says 'Age: unknown')

Natsu is più than 400 years old same as the other dragon slayers, gajeel, wendy, sting, and rougue all the dragonslayers who were trained da dragons, in the episode were Freed set an enchantment so only people 40 years o so under can leave the guild hall o something, that is why Natsu and Gajeel couldn't unisciti the fight of Fairy Tail, but they were able to after Levi lifted the enchantment

Natsu is 17 years old,..BTW NaLu forever <3 <3 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I thought he was 18

None of the characters have guaranteed ages except Erza and Lucy. Lucy is 17. Erza is 19. NaLu 4 ever!!!!!!!!!!!!!!!!!!!!!!!!!!

Definitely not old enough to drink birra .oh and when the the campana, bell will NaLu happen before I kill myself .

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425?

Physically he is probably around 18 years old. But biologically he is over 400.