From the Vrienden Universe, a fictional wiki
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 and age }} {{Birth date}} with suffix '(age N )'.{{ 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.
Death templates Description / use {{ Death date }} To display a death date and related hidden metadata. {{ Death date and age }} {{Death date}} with suffix '(aged N )'; also called with {{event date and age}} .{{ Death year and age }} To display a year of, and approximate age at death.
age only
Reverse-determined age template Description / use {{ Age }} Age based on number of complete years between two dates.