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.
Syntax
Typical use
{{birth based on age as of date| age | year | month | day }}
Code:
{{birth based on age as of date|50|2022|7|14}}
Result:
1971 or 1972 (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|2022|7|14|noage=1|slash=y}}
Result:
1971/1972
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|2022|7|14|slash=yes}}
Result:
1971/1972 (age 51–52)
Examples
If, for example, a reference dated July 4, 2022 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|2022|July|4}}
The following examples are for a person reported as being 50 years old in 2023
Template code
Result
{{birth based on age as of date|50|2023|06|14}}
1972 or 1973 (age 51–52)
{{birth based on age as of date|50|2023|June|14}}
1972 or 1973 (age 51–52)
{{birth based on age as of date|50|2023|12|31}}
1972 or 1973 (age 50–51)
{{birth based on age as of date|50|2023|Jan|1}}
1972 or 1973 (age 51–52)
{{birth based on age as of date|50|2023|12|31|noage=1}}
1972 or 1973
{{birth based on age as of date|50|2023|Jan|1|noage=1}}
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}}.
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.