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How To Calculate Age In SQL Server T-SQL Using DATEDIFF()

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Here is a script to calculate an age of a person using TSQL using Convert(). 
  SELECT FirstName, LastName   
    ,CONVERT(Int, DATEDIFF(day, BirthDate,   
    GETDATE())/365.25) As Age   
  FROM EmployeesDTR
Source: TSQL Reference

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