Question

How do you say? My sisters are older than me or My sister are elder than me. Thanks

Answer 1

From the grammar point of view OLDER is a comparative of OLD. ELDER is an adjective in its basic form; that's why you cannot use it for comparing; means: My sister is elder than me. - a total nonsense! From the lexical point of view see that: http://oald8.oxfordlearnersdictionaries.com/dictionary/Old , http://oald8.oxfordlearnersdictionaries.com/dictionary/elder . :)

Answer 2

Correct is: My sisters are older than me. Because we cannot use elder with than.

Answer 3

elder usually describes an old person in a family, an aged person, a senior.