Several factors influence an individual's metabolism rate, including age, gender, muscle mass, and activity level. Metabolism generally slows with age due to a decrease in muscle mass and hormonal changes. Genetics also play a role, as some individuals naturally have higher metabolic rates than others. Physical activity, especially strength training, can help boost metabolism by increasing muscle mass. Furthermore, certain dietary factors, such as meal frequency and composition, can influence metabolic rates, making consistent healthy eating essential.