elder or older?
Elder and eldest are used only of people, and usually in the context of family relationships: She is the elder of Ruth's daughters.Mark is my eldest son.Older and oldest can apply to things as well as people, and can be used in a wider range of grammatical constructions: I am older than David.It is the oldest church in Paris. When eldest (or less commonly, elder) is used after a verb (for example, be), it has to be preceded by the: Who is the eldest? not Who is eldest?
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