Final answer:
The typical person will experience a decline in immune function with age.
Thus option C. Decline. is correct answer.
Step-by-step explanation:
The typical person will experience a decline in immune function with age. This age-related decline is called immunosenescence and it generally begins at around age 50, worsening with increasing age. Older people are generally more susceptible to disease compared to younger people due to this decline in immune function.
Typically, as a person ages, there is a decline in immune function. This phenomenon is often referred to as immunosenescence, and it involves a gradual deterioration of the immune system over time. This decline can result in a decreased ability to respond to infections and an increased susceptibility to certain diseases.
Thus option C. Decline. is correct answer.