Age discrimination is prohibited by which of the following?

The Age Discrimination in Employment Act, enacted in 1967, specifically addresses age discrimination in the workplace, making it illegal for employers to discriminate against individuals who are 40 years of age or older in various employment practices such as hiring, promotion, discharge, compensation, and other terms of employment. This federal law aims to protect older workers from being unfairly treated due to their age and establishes a framework for individuals to seek recourse if they believe they have been discriminated against.

While state laws and other acts may contain provisions that relate to age discrimination, the Age Discrimination in Employment Act is the primary federal law that explicitly prohibits age-based discrimination in employment settings. This makes it the most direct and relevant answer to the question regarding the prohibition of age discrimination.