<P> Finn is currently 16 as confirmed in the season 6 finale `` The Comet '' and the early season 8 episode `` Wheels '' . At the beginning of the series , Finn was a 12 - year - old boy who is supposedly the only known human in the Land of Ooo . During the episode `` Mystery Train '' , Finn turned 13 ; it has been stated that the episode first airing date ( March 14 ) is Finn 's birthday . After season 3 ended , Pendleton Ward stated in an interview that Finn was 14 . Finn was 15 years old in the second half of Season 5 , according to Adam Muto . In the Season 6 finale , `` The Comet '' , Finn reveals that he has reached 16 years of age . This means that unlike in many other cartoons where characters stay the same age or age through time skips , in Adventure Time time passes regularly . </P>
<P> Finn is currently 16 as confirmed in the season 6 finale `` The Comet '' and the early season 8 episode `` Wheels '' . At the beginning of the series , Finn was a 12 - year - old boy who is supposedly the only known human in the Land of Ooo . During the episode `` Mystery Train '' , Finn turned 13 ; it has been stated that the episode first airing date ( March 14 ) is Finn 's birthday . After season 3 ended , Pendleton Ward stated in an interview that Finn was 14 . Finn was 15 years old in the second half of Season 5 , according to Adam Muto . In the Season 6 finale , `` The Comet '' , Finn reveals that he has reached 16 years of age . This means that unlike in many other cartoons where characters stay the same age or age through time skips , in Adventure Time time passes regularly . </P>
how old is finn in adventure time season 8
how old is finn in adventure time season 8
16
16