Table 1.

Age-Related Physiological Changes Consistent with Androgen Deficiency

Body Composition	Brain Function
↓ Lean body mass	↓ Libido and erections
↑ Fat mass	↓ Energy
↓ Muscle mass and strength	Irritability and depressed mood
↓ Bone mineral density	↓ Cognitive function
↓ Male hair and skin thickness	↓ Sleep quality