Ageism is a form of bias against, discrimination towards, or bullying towards individuals and groups based on their age. It can affect people of all ages, from children to older adults, and can be found within institutions, in interactions between people, and within ourselves. Ageism is often attributed to fears of death and disability, with avoiding, segregating, and rejecting older people serving as coping mechanisms that allow people to avoid thinking about their own mortality. Ageism can intersect and exacerbate other forms of disadvantage, including those related to sex, race, and disability. Ageism can have serious and far-reaching consequences for peoples health, well-being, and human rights, and it can impact our health, longevity, and well-being while also having far-reaching economic consequences. Ageism can be combated through policies and laws, educational activities, and intergenerational interventions.