Older and Elder
Incorrect . This building is elder than that one.
Correct : This building is older than that one.
Incorrect : My older brother is a doctor.
Correct : My elder brother is a doctor.
Note : 'Older’ refers to both persons and things but 'elder’ refers to persons only and is used of related persons. Again, elder cannot be followed by ‘than’.
Incorrect: Zinnia is elder than Alan.
Correct : Zinnia is older than Alan.
But you can say:
Which is the elder of the two sisters?
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