The Age Discrimination Act of 1967 protects employees based on what criterion?

The Age Discrimination Act of 1967 specifically protects employees from discrimination based on age, focusing on those who are 40 years of age or older. This legislation was established to combat ageism in the workplace and ensure that older workers are not unfairly treated or discriminated against when it comes to hiring, promotions, job assignments, and other employment-related decisions. The act aims to provide equal opportunities regardless of age and acknowledges the contributions that older workers make to the workforce.

The other options do not align with the Act's specific focus on age discrimination. Employment history and marital status do not directly relate to age discrimination, and disability is covered under different legislation, such as the Americans with Disabilities Act (ADA). Hence, the correct answer emphasizes the protection afforded to individuals based on their age, particularly those in the older demographic.