Final answer:
In Mexico and Spain, students start school at the age of 3.
Step-by-step explanation:
In Mexico, students typically start school at the age of 3. They enroll in preschool or pre-kinder (preescolar) programs. In Spain, students start school at the age of 3 as well, attending a preschool called Educación Infantil.
Learn more about school starting age in Mexico and Spain