The main cause of low Testosterone can vary among individuals. In aging men, the primary cause of low Testosterone is typically attributed to natural age-related decline. However, low Testosterone can also be caused by other factors, such as certain medical conditions (e.g., hypogonadism, obesity, diabetes), hormonal disorders, testicular damage or dysfunction, chronic illnesses, certain medications (e.g., corticosteroids, opioids), and lifestyle factors (e.g., excessive alcohol consumption, poor nutrition). It's important to consult with a healthcare provider to identify the underlying cause of low Testosterone and determine the most appropriate course of action for management and treatment.