Template:Birth year and age/doc

This is a documentation subpage for Template:Birth year and age (see that page for the template itself).
It contains usage information, categories and other content that is not part of the original template page.

{{Birth year and age}}

Let us assume:

1. that the person in question was born some time in 1971; and
2. that the present date is 4 June 2026.

• If the person was born after 4 June 1971 then she will be 54 years old on 4 June 2026 as she has not had her 55th birthday yet. On the other hand, if she was born exactly on or before 4 June 1971, then she will be 55 years old.

Therefore, the template {{Birth year and age|1971}}

displays her birth year and age as: 1971 (age 54–55)

• Optionally, if we know the person's birth month but not the day, we can also have the template display the month.

Let us assume that the person was born in June 1971. Therefore:

• If it is presently January 2026, then this year the person has not had her birthday yet. Therefore, the template {{Birth year and age|1971|6}} displays her birth year and age as: 1971 (age 54).
• If it is presently June 2026, we do not know whether the person has had her birthday this year yet since her day of birth is unknown. Therefore, the template displays her birth year and age as: 1971 (age 54–55).
• If it is presently December 2026, then this year the person has already had her birthday. Therefore, the template displays her birth year and age as: 1971 (age 55).

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