Template:Birth based on age as of date

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For a person whose date of birth is unknown, this template estimates the person's birth year and current age based on a given age at a certain date. This is useful when a reliable source states only their age at the time of publication.

If you have reason to believe the subject's age has been discussed by sources at more than one point in time, consider not using this template which, by definition, introduces a whole year's worth of error margin. For example, if a reliable source on May 1, 2020 states Mr X is 39 years old and a different source on August 1, 2020 states Mr X is 40 years old, then Mr X must have been born between May 2, 1980 and August 1, 1980. Using this template would suggest a birth year of "1980 or 1981" using the first source, or "1979 or 1980" using the second source. Since the two sources together establish 1980 as the birth year, using this template would be inappropriate.

If the subject has died, please use {{Birth based on age at death}} instead of this template. While Template:Asof that template is just a wrapper of this one, this leaves open the possibility to use that template to recategorize the subject. Also, it makes sure you don't forget to suppress the age field.

Syntax

Typical use

 {{birth based on age as of date | age | year | month | day }}

Code:

{{birth based on age as of date|50|2023|9|19}}

Result:

1972 or 1973 (age 51–52)

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 only the publication year for a source is known, the "day" and "month" fields can be omitted.

No age

In some contexts—like the lead sentence of a biography—it may be desirable to show only the birth year, and not a person’s age. To suppress the age field, set |noage=yes:

Code:

{{birth based on age as of date|50|2023|9|19|noage=1}}

Result:

1972 or 1973

Separator

In general, the two possible birth years should be written out as: 1950 or 1951. In contexts which are tight for space, the separator between the two possible years should be a slash: 1950/1951.

To use the / separator, add |slash=yes.

Code:

{{birth based on age as of date|50|2023|9|19|slash=yes}}

Result:

1972/1973 (age 51–52)

Examples

If, for example, a reference dated July 4, 2023 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|2023|July|4}}

The following examples are for a person reported as being 50 years old in 2024

Template:Sans-serif Result Template:Braces 1973 or 1974 (age 50–51) Template:Braces 1973 or 1974 (age 50–51) Template:Braces 1973 or 1974 (age 50–51) Template:Braces 1973 or 1974 (age 51–52) Template:Braces 1973 or 1974 Template:Braces 1973 or 1974 Template:Braces 1973 or 1974 (age 50–51) Template:Braces 1973 or 1974 (age 51–52) Template:Braces 1973 or 1974 (age 50–51) Template:Braces 1973 or 1974 (age 50–51)

This template calculates the birth year and current age based on the age as of a date.

Template parameters[Edit template data]

This template prefers inline formatting of parameters.

Parameter		Description	Type	Status
Age	1	Age of subject at date of reference's publication. Example 55	Number	required
Year	2	Year of publication of reference. Example 1950	Number	required
Month	3	Month of publication of reference. Example 8 or August	String	suggested
Day	4	Day of publication of reference. Example 21	Number	suggested
Hide age	noage	Set to a value of 'yes' to display year of birth without the age Default no (i.e., the default is to show the age) Example 1	Boolean	optional
Slash separator	slash	Set to 'yes' to separate years with a '/' for tight spaces (e.g., table cells) Suggested values yes Default no	Boolean	optional

Redirects

• Template:Bbad
• Template:Birth year from age as of date
• Template:Birth year from age at date

See Also

• Template:Birth date and age when exact date of birth is known

The above documentation is transcluded from Template:Birth based on age as of date/doc. (edit | history)
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