The syntax is: . Parameters and are optional. By default it shows the quantity. (optional) Gets the unit from table i18n["years-old"] at Module:/i18n for singular, plural or other plural forms as paucal used in Slavic languages as Russian. See parser function PLURAL at mw:Help:Magic words#Localization. (optional) Format using a pattern with $1 as a placeholder for the quantity. A common use case is " ($1 years old)". It does not evaluate the expression in singular, plural or paucal and fetches the unit from . As an alternative you can define a global pattern in table i18n["years-old"] that allows the parameter $1.