Final answer:
A gastrectomy is most commonly performed in individuals over the age of 60 with conditions related to the gastrointestinal system.
Step-by-step explanation:
A gastrectomy is a surgical procedure that involves removing all or part of the stomach. It is most commonly performed in individuals with certain medical conditions, such as stomach cancer, peptic ulcers, or severe obesity. While it can be performed in different demographics, it is most commonly performed in individuals who are over the age of 60 and have conditions related to the gastrointestinal system.