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If saying 同{おな}い年{どし} in daily conversation is just something you'd say
without thinking twice, _then I have no further questions._

But, doesn't saying 同い年 sound sort of stand-offish. Saying 同い年 is a hint to
the listener that he is misunderstanding our level of friendship.

My asking question to Empress Michiko at お茶会

> (私): "その二人子、同い年ですか。

This is normal usage.

My sister-in-law asking me a question at お寿司屋さん

> (義理姉さん response #1): "その二人子、年齢が一緒ですか。  
>  (義理姉さん response #2): "その二人子、同い年ですか。

I'd expect response #1.  
Hearing #2, I'd be like that was completely uncalled for. What is her problem?
If she wants to keep her distance, then so be it.

_BTW_ :  
同い年 **is** considered 当て字, right? I've never seen a word made 当て字 by its 送りがな.
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2016-04-22T15:21:39.947
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2016-04-22T16:00:34.800
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question
nuances ateji
Nuance of saying "同い年"? And, it is 当て字?
同い年 is the sound change of 同じ年(same age). And 同い年 is often used as 同じ学年(same
grade in school).
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2016-04-22T15:55:12.007
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2016-04-22T16:00:34.800
2016-04-22T16:00:34.800
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