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"?
Best Answer
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.