Step 1 :The exponential decay model for carbon-14 is given by \(A=A_{0} e^{-0.000121 t}\), where \(A\) is the remaining amount of carbon-14, \(A_{0}\) is the original amount of carbon-14, and \(t\) is the time in years.
Step 2 :In this case, we know that \(A\) is 33% of \(A_{0}\), so we can set up the equation \(0.33A_{0}=A_{0} e^{-0.000121 t}\) and solve for \(t\).
Step 3 :By solving the equation, we find that \(t\) is approximately 9163.
Step 4 :Final Answer: The paintings are approximately \(\boxed{9163}\) years old.