Determining a 'perfect weight' is complex, as it depends on multiple factors beyond just height, including age and lifestyle. While Body Mass Index (BMI) offers a general guideline by comparing weight to height, it has limitations. BMI doesn't distinguish between muscle and fat, meaning individuals with high muscle mass might appear overweight. Doctors often consider other indicators like waist size, which is linked to health risks, and acknowledge that metabolism and muscle mass change with age, influencing weight.