the older person of two persons
persons of greater age
(of members of a family, especially closely related members, or of two indicated members) older; senior
before or after a person's name to distinguish that person from another of the same name
"Bill Adams, Sr."
He turned to her..as to a mother or an elder sister.
出自： I. Murdoch
The elder Gosse was a naturalist.
出自： J. Gross
误 Daff is elder than Tom.
正 Daff is older than Tom.