Several factors influence an individual’s metabolism, including age, gender, muscle mass, and genetic predisposition. As individuals age, their metabolic rate tends to decrease, often due to muscle loss. Men typically have a higher metabolic rate than women due to greater muscle mass. Additionally, lifestyle factors such as physical activity levels and dietary habits play significant roles in determining metabolism. Regular strength training can help preserve and increase muscle mass, boosting metabolism. Lastly, certain medical conditions and medications can also affect metabolic rates, highlighting the importance of a tailored approach to health and fitness.