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edited Jan 15, 2016 at 3:08

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17 years old, at time of posting this answer

In the Season 6 finale "The Comet", Finn states that he is 16:

FINN: Besides, it was like 40 years ago. I'm 16! I don't have a star to revolve around to track time.

Since time in Adventure Time elapses at the same rate as in the real world, and since we are currently near the end of Season 7, this would make Finn 17 years old.

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created Jan 15, 2016 at 2:55

Praxis

111.7k
50
516
693

17 years old at time of posting this answer

In the Season 6 finale "The Comet", Finn states that he is 16:

FINN: Besides, it was like 40 years ago. I'm 16! I don't have a star to revolve around to track time.

Since time in Adventure Time elapses at the same rate as in the real world, and since we are currently near the end of Season 7, this would make Finn 17 years old.