Other forms: ageisms
Ageism is discriminating against someone because of how old they are. Forcing a worker to retire because they've just turned 65 is an example of ageism.
Ageism, like other forms of discrimination, can take many forms. Some of these are illegal, like denying someone an apartment or a job because of their age. A boss who chooses a younger worker for a project instead of an older, more experienced employee may be guilty of ageism. Other forms of this prejudice are more subtle, like patronizing elderly people by treating them like children, or calling them "sweetheart." Ageism was coined in 1969, modeled on racism.