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Template:Birth based on age as of date

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This template uses Lua:

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.

This template can be used whether only one or multiple points in time are available.
This template is intended for living people.

If the subject has died, please use {{Birth based on age at death }} instead of this template. While as of 2024[update] 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|2024|7|12}}
Result:
1973 or 1974 (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=any value:

Code:
{{birth based on age as of date|50|2024|7|12|noage=yes}}
{{birth based on age as of date|50|2024|7|12|noage=1}}
Result:
1973 or 1974
1973 or 1974
Note
The parameter |noage= was added April 2013 and initially only accepted a value of 1, such as |noage=1. It was updated July 2019 to accept any value, such as |noage=yes.

Slash 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=any value.

Code:
{{birth based on age as of date|50|2024|7|12|slash=yes}}
{{birth based on age as of date|50|2024|7|12|slash=1}}
Result:
1973/1974 (age 51–52)
1973/1974 (age 51–52)
Note
The parameter |slash= was added April 2023 when the template was updated to separate years with or instead of /. It replaced the now deprecated parameter |mos=, which was added November 2015 and removed July 2023 .

Multiple dates

 {{birth based on age as of date | age | year | month | day | age | year | month | day }}
Code:
{{birth based on age as of date|50|2024|7|12|51|2024|12|31}}
Result:
1973 (age 52)

Two or more dates can be entered, using the same format as for a single date. In this case, the "day" and "month" fields cannot be omitted.

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}}

The following examples are for a person reported as being 50 years old in 2025

Template code Result
{{birth based on age as of date | 50 | 2025 | 06 | 12}} 1974 or 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025 | June | 12}} 1974 or 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025 | 12 | 31}} 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025 | Jan | 1}} 1974 or 1975 (age 51–52)
{{birth based on age as of date | 50 | 2025 | 12 | 31 | slash=yes}} 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025 | Jan | 1 | slash=1}} 1974/1975 (age 51–52)
{{birth based on age as of date | 50 | 2025 | 12 | 31 | noage=yes}} 1975
{{birth based on age as of date | 50 | 2025 | Jan | 1 | noage=1}} 1974 or 1975
{{birth based on age as of date | 50 | 2025 | 12 | 31 | noage=yes | slash=yes}} 1975
{{birth based on age as of date | 50 | 2025 | Jan | 1 | noage=1 | slash=1}} 1974/1975
{{birth based on age as of date | 50 | 2025 | June}} 1974 or 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025 | Jan}} 1974 or 1975 (age 51–52)
{{birth based on age as of date | 50 | 2025 | 12}} 1974 or 1975 (age 50–51)
{{birth based on age as of date | 50 | 2025}} 1974 or 1975 (age 50–51)
{{birth based on age as of date | 50 | 2024 | 7 | 12 | 51 | 2024 | 12 | 31}} 1973 (age 52)

TemplateData

This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. See a monthly parameter usage report for Template:Birth based on age as of date in articles based on its TemplateData.

TemplateData for Birth based on age as of date

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.

Template parameters[Edit template data ]

This template prefers inline formatting of parameters.

ParameterDescriptionTypeStatus
Age1

Age of subject at date of reference's publication.

Example
55
Numberrequired
Year2

Year of publication of reference.

Example
1950
Numberrequired
Month3

Month of publication of reference.

Example
8 or August
Stringsuggested
Day4

Day of publication of reference.

Example
21
Numbersuggested
Hide agenoage

Set to any value to display birth years without the ages. If this parameter is omitted or contains no value, the age is displayed.

Suggested values
yes y 1
Booleanoptional
Slash separatorslash

Set to any value to separate birth years with a '/' for tight spaces (e.g., table cells). If this parameter is omitted or contains no value, birth years are separated with ' or '.

Suggested values
yes y 1
Booleanoptional

Tracking category

See also

Birth, death and age templates
birth, death, age
Birth templates  Description / use 
{{Birth date }} To display a birth date and related hidden metadata.
{{Birth date text }}
{{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 date and age in years and days }} {{Birth date and age}}, but with the age displayed in years and days rather than just years.
{{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 as of dates }} To display approximate birth year and current age given several particular dates (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 text }}
{{Death date and age }} {{Death date}} with suffix '(aged N)'; also called with {{event date and age}}.
{{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.
age only
Conventional age templates  Description / use 
{{Age in years, months, weeks and days }} Number of complete years, months, weeks and days between two dates.
{{Age in years, months and days }} Number of complete years, months and days between two dates.
{{Age in years and months }} Number of complete years and remaining months between two dates.
{{Age in years and days }} Number of complete years and remaining days between two dates.
{{Age in years and days nts }} {{Age in years and days}} with output formatted for use in number sortable tables.
{{Age in decimal years }} Number of years between two dates, rounded to the specified number of decimal places.
{{Age in years }} Number of years between two dates.
{{Age in years nts }} {{Age in years}} with output formatted for use in number sortable tables.
{{Age in months }} Number of months between two dates.
{{Age in weeks and days }} Number of weeks and days between two dates.
{{Age in weeks }} Number of weeks between two dates.
{{Age in days }} Age in days between two dates.
{{Age in days nts }} {{Age in days}} with output formatted for use in number sortable tables.
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.
start / end dates
Date-focused templates  Description / use 
{{Start date }} / {{End date }}
{{Start date text }} / {{End date text }}
{{Start date and age }} / {{End date and age }}
miscellaneous
Template  Description / use 
{{OldStyleDate }} Dates in Julian calendar.
{{OldStyleDateDY }} As {{OldStyleDate}} but used when Julian / Gregorian dates fall in different years.
{{OldStyleDateNY }} As {{OldStyleDate}} but without the year.
{{Unidentified for }}
{{Missing for }}
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