Their birthdays vs Their birthday

Both phrases are correct, but they are used in different contexts. 'Their birthdays' is used when referring to multiple people celebrating their individual birthdays, while 'their birthday' is used when referring to a group of people celebrating a shared birthday.

Last updated: April 01, 2024

Their birthdays

This phrase is correct and commonly used when referring to multiple people celebrating their individual birthdays.

Use 'their birthdays' when talking about multiple people each celebrating their own birthday. It indicates that each person has a separate birthday.

Examples:

I need to remember all of their birthdays this month.
Their birthdays are all in December.

Alternatives:

the birthdays of all of them
the birthdays of the group
the individual birthdays of each of them
the separate birthdays of each of them
each person's birthday

Their birthday

This phrase is correct and commonly used when referring to a group of people celebrating a shared birthday.

Use 'their birthday' when talking about a group of people who share the same birthday. It indicates that they are celebrating together on the same day.

Examples:

They are all going out to celebrate their birthday together.
Their birthday party is next Saturday.

Alternatives:

the birthday they share
the shared birthday of the group
the group's birthday
the collective birthday of the group
the birthday they all celebrate

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