View source for Template:Birth year and age/doc

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====<nowiki>{{Birth year and age}}</nowiki>====
Let us assume:
#that the person in question was born some time in {{#expr: {{CURRENTYEAR}} - 55}}; and
#that the present date is {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}}.

*If the person was born after {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{#expr: {{CURRENTYEAR}} - 55}} then she will be {{age|{{#expr: {{CURRENTYEAR}} - 55}}|{{CURRENTMONTH}}|{{#expr: {{CURRENTDAY}} + 1 }} }} years old on {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} as she has not had her 55th birthday yet. On the other hand, if she was born exactly on or before {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{#expr: {{CURRENTYEAR}} - 55}}, then she will be 55 years old. 

::Therefore, the template {{tlx|Birth year and age|{{#expr: {{CURRENTYEAR}} - 55}} }}
::displays her birth year and age as: {{birth year and age|{{#expr: {{CURRENTYEAR}} - 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 {{#expr: {{CURRENTYEAR}} - 55}}. Therefore:
::*If it is presently January {{CURRENTYEAR}}, then this year the person has not had her birthday yet. Therefore, the template {{tlx|Birth year and age|{{#expr: {{CURRENTYEAR}} - 55}}|6}} displays her birth year and age as: {{#expr: {{CURRENTYEAR}} - 55}} (age 54).
::*If it is presently June {{CURRENTYEAR}}, 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: {{#expr: {{CURRENTYEAR}} - 55}} (age 54–55).
::*If it is presently December {{CURRENTYEAR}}, then this year the person has already had her birthday. Therefore, the template displays her birth year and age as: {{#expr: {{CURRENTYEAR}} - 55}} (age 55).
{{GFDL}}
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