 | Do NOT use this template when the person is dead; consider {{Birth based on age at death}} instead. |
 | This template employs intricate features of template syntax.
You are encouraged to familiarise yourself with its setup and parser functions before editing the template. If your edit causes unexpected problems, please undo it quickly, as this template may appear on a large number of pages.
You can conduct experiments, and should test all major changes, in either this template's sandbox, the general template sandbox, or your user space before changing anything here. |
This template calculates a person's birth year and current age based on their previous age at a certain date. This is useful when a reliable source states only their age at the time of publication.
Syntax
{{birth based on age as of date |age |year|month|day}}
The age, year, and day must be supplied as natural numbers; month can be specified as a natural number as well as by name or abbreviation (e.g. "August" or "Aug"). The Gregorian calendar is assumed, with no special support provided for dual dating or the difference between Old Style and New Style dates.
If they are not known, the "day" and "month" fields can be omitted; this is useful if, for example, only the publication year for a source is known.
Options
To suppress the age field:
{{birth based on age as of date |age |year|month|day |noage=1}}
With the "noage=1" option, the month and day can be "1".
To replace the '/' separator with ' or ' in compliance with WP:APPROXDATE, add |mos=1
{{birth based on age as of date|50 |2024|12|6|mos=1}}
- 1973 or 1974 (age 51)
Examples
If, for example, a reference dated July 4, 2024 mentions that someone is 50 years old, that person's birth year and age can be rendered using:
{{birth based on age as of date |50 |2024|July|4}}
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The following examples are for a person reported as being 50 years old in 2024
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| Template code | Result |
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| {{birth based on age as of date | 50 | 2024 | 12 | 6}} | 1973/1974 (age 51) | | {{birth based on age as of date | 50 | 2024 | December | 6}} | 1973/1974 (age 51) | | {{birth based on age as of date | 50 | 2024 | 12 | 31}} | 1973/1974 (age 50–51) | | {{birth based on age as of date | 50 | 2024 | Jan | 1}} | 1973/1974 (age 51–52) | | {{birth based on age as of date | 50 | 2024 | 12 | 31 | noage=1}} | 1973/1974 | | {{birth based on age as of date | 50 | 2024 | Jan | 1 | noage=1}} | 1973/1974 | | {{birth based on age as of date | 50 | 2024 | December}} | 1973/1974 (age 50–52) | | {{birth based on age as of date | 50 | 2024 | Jan}} | 1973/1974 (age 51–52) | | {{birth based on age as of date | 50 | 2024 | 12}} | 1973/1974 (age 50–52) | | {{birth based on age as of date | 50 | 2024}} | 1973/1974 (age 50–52) |
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Birth, death and age templates |
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birth, death, age |
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| Combined BDA template | Description / use | | {{BirthDeathAge}} | Combines functions of {{Birth date}}, {{birth-date}}, {{birth date and age}}, {{birth year and age}}, {{death date}}, {{death-date}}, {{death date and age}}, and {{death year and age}}. |
| Birth templates | Description / use | | {{Birth date}} | To display a birth date and related hidden metadata. | | {{Birth-date}} | | | {{Birth date and age}} | {{Birth date}} with suffix '(age N)'. | | {{Birth date and age2}} | {{Birth date and age}} plus age as of a specified date. | | {{Birth-date and age}} | As {{Birth date and age}}, but accepts dates in text form ('15 June 1950', 'June 15, 1950', 'June 1950', etc). | | {{Birth year and age}} | Year of birth and approximate age. | | {{Birth based on age as of date}} | To display approximate birth year and current age given a particular date (e.g. when a dated reference mentions the age of a person), only works for living people. | | {{Birth based on age at death}} | To display approximate birth year based on age at death, or on age at a specific date if death date isn't known. |
| Death templates | Description / use | | {{Death date}} | To display a death date and related hidden metadata. | | {{Death-date}} | | | {{Death date and age}} | {{Death date}} with suffix '(aged N)'; also called with {{event date and age}}. | | {{Death-date and age}} | As {{Death date and age}}, but accepts dates in text form ('15 June 1950', 'June 15, 1950', 'June 1950', etc). | | {{Death date and given age}} | To display a death date and specified age. | | {{Death year and age}} | To display a year of, and approximate age at death. |
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age only |
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| Reverse-determined age template | Description / use | | {{Age}} | Age based on number of complete years between two dates. | | {{Age nts}} | {{Age}} with output formatted for use in number sortable tables. | | {{Age as of date}} | Current age (in years) from a known age at a specified date. | | {{Age for infant}} | Current age for infant: months and days up to one year, years and months up to three years, and years beyond age 3. |
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Template parameters
This template prefers inline formatting of parameters.
| Parameter | Description | Type | Status |
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| Age | 1 | Age of subject at date of reference's publication. - Example
- 55
| Number | required |
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| Year | 2 | Year of publication of reference. - Example
- 1950
| Number | required |
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| Month | 3 | Month of publication of reference. - Example
- 8 or August
| String | suggested |
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| Day | 4 | Day of publication of reference. - Example
- 21
| Number | suggested |
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| MOS compliance | mos | Set to a value of 1 to replace the '/' separator with ' or ' in compliance with [[WP:APPROXDATE]]. - Example
- 1
| Number | optional |
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| Hide age | noage | Set to a value of 1 to display year of birth without the age. - Example
- 1
| Number | optional |
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Redirects
Template documentation