Final answer:
The clearance/elimination of morphine in infants reaches adult levels around 6 months of age.
Step-by-step explanation:
Infants have different rates of drug clearance compared to adults. In the case of morphine, the clearance/elimination reaches adult levels around 6 months of age. This means that the rate at which an infant's body processes and eliminates morphine becomes similar to that of an adult by around 6 months.