Final answer:
In 'The House of the Scorpion' by Nancy Farmer, Matt is 14 years old when El Patron has a heart attack.
Step-by-step explanation:
The question refers to the character Matt from the novel The House of the Scorpion by Nancy Farmer, which is a work of fiction studied in English literature classes. When El Patron, the powerful drug lord and the patriarch of the Alacran estate, has a heart attack, Matt is 14 years old. This event is crucial to the plot as it signifies a significant turning point in Matt's life, where he starts to learn more about his origins and the dark secrets of El Patron's life, leading to profound developments in the story arc.