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At what ages can type 2 diabetes mellitus develop?

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An anatomical illustration of the human pancreas shows its location near the stomach and intestines, a detailed cross-section highlighting ducts and the islet of Langerhans, and an inset of pancreatic tissue histology with labeled alpha, beta, and delta cells. — diabetes mellitus The islets of Langerhans are responsible for the endocrine function of the pancreas. Each islet contains beta, alpha, delta, and pancreatic polypeptide (PP) cells that are responsible for the secretion of pancreatic hormones. Beta cells secrete insulin, a well-characterized hormone that plays an important role in regulating glucose metabolism.

While type 2 diabetes mellitus is most frequently diagnosed in adults—particularly older adults—it is not restricted to any specific age group.12

Although it was historically classified as "adult-onset" diabetes, type 2 diabetes can occur in children and adolescents as well. Regardless of these former classifications, the condition can develop at any age.12