Final answer:
Reticulocytes spend a short time in the bone marrow before being released into the bloodstream, where they mature into erythrocytes and circulate for about 120 days.
Step-by-step explanation:
In healthy individuals, reticulocytes spend a short amount of time in the bone marrow before being released into the bloodstream. Once in the bloodstream, they mature into erythrocytes and circulate for an average of 120 days.