The Thirteenth Year (1999) is a TV Movie, Adventure, Comedy, Family film that follows a teen learns that his birth mother is a mermaid after he begins to grow fins and slimy scales on his thirteenth birthday. Currently, you can watch The Thirteenth Year on Hulu, Disney Plus, Amazon Video, Google Play Movies. Streaming availability may vary by country and platform over time. It has a user rating of 6.6 out of 10 from 246 votes. Fans of tv movie movies may also want to explore similar titles below.