Ageism is a form of discrimination or prejudice based on a person's age. It involves stereotyping, bias, or discriminatory actions against individuals or groups because of their age, typically targeting older adults or, less commonly, younger individuals. Ageism can manifest in various ways, such as in the workplace, healthcare, social settings, or even in personal relationships.

In the context of older adults, ageism may involve assumptions about declining abilities, outdated skills, or stereotypes about behavior and interests. This can lead to exclusion, limited opportunities, or unfair treatment based solely on someone's age. On the other hand, ageism towards younger individuals might involve dismissing their ideas, undervaluing their contributions, or making assumptions about their lack of experience.

Efforts to combat ageism often focus on promoting understanding, challenging stereotypes, and advocating for fair treatment and equal opportunities regardless of age.