Which age group is primarily protected under the Age Discrimination in Employment Act (ADEA)?

The Age Discrimination in Employment Act (ADEA) specifically protects individuals who are aged 40 and older from discrimination based on age in various aspects of employment, including hiring, promotions, and layoffs. This law was enacted to combat the stereotypes and biases that can lead to age-related discrimination in the workplace. By focusing on this age group, the ADEA aims to ensure that older workers are afforded the same employment opportunities and protections as their younger counterparts.

The classifications among the other options do not align with the ADEA's focus. Individuals under 30 and those specifically between 25 and 35 do not fall under the ADEA’s protections, as the law is designed to address the potential disadvantages faced by older employees. Furthermore, the idea that all individuals regardless of age are protected under the ADEA is inaccurate; the ADEA is concentrated specifically on those aged 40 and above, highlighting the law's intent to mitigate age discrimination for older workers in the labor market.