You have to be ___ 18 to see this film.

1. over
2. to
3. at
4. on

“Over 18” means older than 18 years, indicating the minimum age requirement for restricted content. Alternative expressions include “above 18” or “18 or older.” “Over” is commonly used with age restrictions, ticket prices, and measurements. Understanding age-related expressions helps learners navigate everyday situations involving legal requirements, purchases, and permissions in English-speaking environments.