Based on the information available, there are no specific age limits for the use of Lipitor (atorvastatin), a cholesterol-lowering medication. However, the use of this drug in children and elderly populations may have some considerations.

For pediatric patients, Lipitor is approved for use in children aged 10 years and older to treat certain conditions related to high cholesterol levels [1]. The dosage is usually based on the child's weight. It is important to note that the long-term effects of using Lipitor in children have not been established [1].

In the elderly population, there are also no specific age limits for Lipitor use. However, older adults may be more susceptible to the side effects of this medication, particularly muscle-related issues [2]. Therefore, healthcare providers should closely monitor elderly patients taking Lipitor and consider adjusting the dosage as necessary [2].

In summary, while there are no specific age limits for Lipitor use, children under 10 years of age and elderly patients may require special consideration due to potential differences in drug metabolism and increased susceptibility to side effects. Always consult with a healthcare provider for personalized medical advice.

Sources:
[1] "Lipitor- Atorvastatin Calcium Tablets." DailyMed, National Library of Medicine, <https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=8d6e6a4e-9d2e-4e2e-a2d3-8f189f15a1f5&type=display>.
[2] "Atorvastatin (Oral Route) Side Effects." Mayo Clinic, Mayo Foundation for Medical Education and Research, 1 Jan. 2022, <https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067230?p=1>.
[3] "Lipitor (Atorvastatin) Drug Patent Expiration Dates." DrugPatentWatch, <https://www.drugpatentwatch.com/patent/lipitor-atorvastatin/>.