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Usage
{{death date and age|birth_year|birth_month|birth_day|death_year|death_month|death_day}}
Example
{{death_date_and_age|1980|09|22|2016|01|01}}
gives:
September 22, 1980 (1980-09-22) (aged 45){{#set:
|has birth_day=1980-09-22
}}