The Thirteenth Year (1999)

A teen learns that his birth mother is a mermaid after he begins to grow fins and slimy scales on his thirteenth birthday.

Genres: TV Movie, Adventure, Comedy, Family

What to watch after The Thirteenth Year

• Halloweentown (1998) — Duwayne Dunham directed both
• The Flintstones (1994) — Same feel: whimsical, fun
• 13 Going on 30 (2004)
• Teen Beach Movie (2013)
• Ruby Gillman: Teenage Kraken (2023) — Same subject: mermaid
• Sabrina the Teenage Witch (1996) — Same subject: birthday