Template:Birth based on age as of date/doc

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.

Typical use
Code: Result: (age 50) 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 yes: Code: Result: (age 50)

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 yes. Code: Result: (age 50)

Examples
If, for example, a reference dated July 4, mentions that someone is 50 years old, that person's birth year and age can be rendered using:

{	"params": { "1": {			"label": "Age", "description": "Age of subject at date of reference's publication.", "example": "55", "type": "number", "required": true },		"2": {			"label": "Year", "description": "Year of publication of reference.", "example": "1950", "type": "number", "required": true },		"3": {			"label": "Month", "description": "Month of publication of reference.", "example": "8 or August", "type": "string", "suggested": true },		"4": {			"label": "Day", "description": "Day of publication of reference.", "example": "21", "type": "number", "suggested": true },		"noage": { "label": "Hide age", "description": "Set to a value of 'yes' to display year of birth without the age", "example": "1", "type": "boolean", "default": "no (i.e., the default is to show the age)" },		"slash": { "label": "Slash separator", "description": "Set to 'yes' to separate years with a '/' for tight spaces (e.g., table cells)", "suggestedvalues": [ "yes" ],			"type": "boolean", "default": "no" }	},	"description": "This template calculates the birth year and current age based on the age as of a date.", "format": "inline", "paramOrder": [ "1",		"2",		"3",		"4",		"noage", "slash" ] }

Redirects

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