Final answer:
The largest component of body composition for a typical 20-24 year old is muscle mass.
Step-by-step explanation:
The largest component of body composition for a typical 20-24 year old is muscle mass. Although the proportion of body water varies and is around 50-70% of total body weight, the primary factor that distinguishes body composition differences in this age group is the amount of muscle tissue. Muscle mass is important for physical strength, metabolism, and overall health.