The World Health Organization defines ageism as “stereotyping, prejudice, and discrimination towards people based on their age” (WHO, 2018). Ageist beliefs and stereotypes are expressed in cultural and media representations, institutional and governmental policies, and social practices that may limit people’s access to the resources necessary to lead healthy and productive lives, such as employment opportunities, housing choices, and health services. Under these circumstances, older persons are more vulnerable to social exclusion, political disempowerment, income insecurity, financial exploitation, homelessness, violence, and abuse leading to human rights violations such as the right to the highest attainable standard of physical and mental health. This chapter examines how these violations impact older persons from a social psychological perspective through a selective literature review focused on ageism issues, including the impact of ageism on how old age is defined as a social category in various societies; how older persons are portrayed in culture and media; and how they are differently perceived and treated as migrants, patients, and workers. Possible best practices to reduce or eliminate ageism globally are also discussed.