Who made the purchase order with the greatest total due before freight? Indicate her employee ID and calculate for his/her age when he/she was hired.
total due before freight = SUBTRACT(TotalDue, Freight); age at the time an employee was hired = SUBTRACT(HireDate, year(BirthDate);
SELECT T2.BusinessEntityID, STRFTIME('%Y', T2.HireDate) - STRFTIME('%Y', T2.BirthDate) FROM PurchaseOrderHeader AS T1 INNER JOIN Employee AS T2 ON T1.EmployeeID = T2.BusinessEntityID ORDER BY T1.TotalDue DESC LIMIT 1