See the DrugPatentWatch profile for methotrexate

Based on the information available, there does not appear to be a maximum age limit for the use of methotrexate. Methotrexate is a medication used to treat certain types of cancer, autoimmune diseases, and ectopic pregnancies [1]. Its use is determined by a variety of factors, including the patient's overall health, the presence of other medical conditions, and the severity of the condition being treated [1].

It is important to note that methotrexate can have serious side effects, particularly at higher doses, and regular monitoring is required for patients taking the medication [1]. The dosage and frequency of administration may vary depending on the patient's individual needs and the specific condition being treated [1].

It is always recommended that patients consult with their healthcare provider for personalized medical advice regarding the use of methotrexate or any other medication.

Sources:

[1] "Methotrexate." MedlinePlus, U.S. National Library of Medicine, 11 Jan. 2022, medlineplus.gov/druginfo/meds/a68/properuse.html.