Write SQL query to solve given problem: Among the employees who were born before 1969, what is the work shift of the 6th oldest employee?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T3.StartTime, T3.EndTime FROM Employee AS T1 INNER JOIN EmployeeDepartmentHistory AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID INNER JOIN Shift AS T3 ON T2.ShiftId = T3.ShiftId WHERE STRFTIME('%Y', T1.BirthDate) < '1969' ORDER BY T1.BirthDate LIMIT 5, 1