Lipitor is a medication used to lower cholesterol levels in the blood. The dosage of Lipitor varies depending on the age of the patient. According to the Mayo Clinic [2], the starting dose of Lipitor for most adults is usually 10-20 mg once a day. However, for individuals over the age of 70, the starting dose is usually 10 mg once a day. This is because older adults are more likely to experience side effects from the medication, such as muscle pain and weakness.

The drug patent watch website [1] provides information on Lipitor's dosages for different age groups. It suggests that the recommended starting dose for adolescents aged 10-17 years is 10 mg once a day. For adults aged 18-64 years, the recommended starting dose is 10-20 mg once a day. For individuals over the age of 65, the recommended starting dose is 10 mg once a day.

The dosage of Lipitor may also be affected by other factors, such as the patient's medical history and other medications they are taking. According to a study published in the National Library of Medicine [3], the dosage of Lipitor should be adjusted for patients with liver or kidney disease.

In conclusion, the age of the patient is an important factor in determining the appropriate dosage of Lipitor. Older adults are typically prescribed a lower starting dose due to their increased risk of side effects. However, other factors such as medical history and medications being taken should also be considered when determining the appropriate dosage of Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915405/