I like being the elder one.
I like being the older one.
Here's a link that may help. org/grammar/british-grammar/elder-eldest-or-older-oldest Both could be correct, depending on the context. Usually, however, I would use 'elder one'.
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Here's a link that may help. dictionary.cambridge.org/grammar/british-grammar/elder-eldest-or-older-oldest
Both could be correct, depending on the context. Usually, however, I would use 'elder one'.