Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the drug patent watch website [1], the patent for Lipitor expired in 2011, making it available as a generic drug. The effectiveness of Lipitor may vary depending on the age of the patient. A study published in the Journal of Clinical Lipidology [2] suggests that the efficacy of statins, including Lipitor, decreases with age due to changes in liver function and medication metabolism. However, the study did not specify a particular age at which Lipitor becomes less effective. It is important to note that the effectiveness of Lipitor can also be influenced by other factors such as diet, exercise, and other medications. The Lipitor website [3] recommends consulting a healthcare provider to determine the appropriate dosage and duration of treatment based on individual needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7307931/
[3] https://www.lipitor.com/en/savings