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If two people were born on the same day, does one say to the other "it's our birthday today" or "it's our birthdays today"?

If they were born on different days, does one say to the other "we should meet on our birthday" or "we should meet on our birthdays"?

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  • Your birthday is the anniversary of your birth. When you say 'born on different days' I assume you mean on the same date in different years? The anniversary is one day so it's 'our birthday'.
    – Kate Bunting
    Commented Dec 17, 2017 at 9:31
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    As Kate said the anniversary is one day so it's our birthday. From the opposite perspective, though, we might say our birthdays are on the same day. If they're born on different days, one says to the other we should meet on our birthdays. I don't understand why the Question belongs here at Users, rather than English Language Learners.
    – Robbie Goodwin
    Commented Dec 17, 2017 at 14:40
  • If two people were born on the same day then they share that single day as their birthday.
    – user63615
    Commented Dec 17, 2017 at 15:46

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Born on the same day: "It's our birthday today."

Born on different days: "We should meet on our birthdays."

The reason is that, in the first case, there is just one day. Therefore, birthday should be singular. In the second case, it should be plural because there are two days (say, June 3 and October 7). Hence, birthdays.

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