Write SQL query to solve given problem: What is the age of the oldest Marketing Specialist by 12/31/2015 and what is his/her hourly rate?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT 2015 - STRFTIME('%Y', T1.BirthDate), T2.Rate FROM Employee AS T1 INNER JOIN EmployeePayHistory AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T1.JobTitle = 'Marketing Specialist' ORDER BY 2015 - STRFTIME('%Y', T1.BirthDate) DESC LIMIT 1