when is the thymus the largest it will ever get?
<answer> The thymus is at its largest and most active during infancy and childhood. <context> The thymus is one of those under appreciated organs you just don’t hear much about. Sitting in your chest, just in front of your heart, the thymus is at its largest and most active during The thymus is one of those under appreciated organs you just don’t hear much about. Sitting in your chest, just in front of your heart, the thymus is at its largest and most active during infancy and childhood. By adulthood, the thymus has shrunk to practically nothing, being mostly replaced by fat.