The start of the show has Finn at twelve, but as the show is going on, Finn is aged up appropriately. Fionna's first appeareance is season three, where she is 14. If we were technically going by season she would be 16, as we are on season five, but I preferred to only age her up one year since there's no assurance of how much time passed.
Re: QUESTION
The start of the show has Finn at twelve, but as the show is going on, Finn is aged up appropriately. Fionna's first appeareance is season three, where she is 14. If we were technically going by season she would be 16, as we are on season five, but I preferred to only age her up one year since there's no assurance of how much time passed.