There is no age limit for diabetes, and it is possible to develop diabetes at any age, as well as at the age of 25. There are four types of diabetes: type 1 diabetes, type 2 diabetes, special type of diabetes and gestational diabetes. type 1 diabetes is mostly seen in adolescents and young adults, presenting the typical three more and one less symptom, prone to diabetic ketoacidosis, with insulin deficiency as the main cause. type 2 diabetes is mostly older than 40 years of age, and there can be a family history of diabetes, combined with hypertension, high blood pressure, high blood cholesterol, obesity and so on. special type of diabetes is associated with genetic mutation or hereditary. Genetic mutation or genetic correlation. 25 years old young patients are likely to have type 1 diabetes, predominantly insulin deficiency, and need to rely on insulin therapy. Type 2 diabetes is also possible, especially if the patient has obesity or a family history of diabetes, and is more likely to be complicated by type 2 diabetes, which is often accompanied by both insulin resistance and insulin deficiency. 25 year old patients may also have special types of diabetes, such as diabetes after recurrent pancreatitis.