Answer:
The answer is: Age Discrimination in Employment Act, Minnie can be required to retire at a certain age, because she is in an occupation where evidence exists that ability to perform the job diminishes significantly with age.
Explanation:
The Age Discrimination in Employment Act (ADEA) protects employees who are at least 40 years old and work for companies that have at least 20 employees.
But there are some exceptions that can apply, specially when the job requires certain abilities that naturally diminish with older age. Since Minnie is a bus driver, her employer can argue that her driving abilities may reduce with age (this is a fact) and that she might endanger others by driving with her abilities reduced.