In which age group would 60% lymphocytes be considered normal?

In infants and young children, particularly in the age group of 6 months to 2 years, lymphocyte percentages can be relatively high. During this stage of development, the immune system is still maturing, and lymphocytes play a crucial role in the body's defense against infections. It is normal for lymphocyte counts to be higher in younger populations, often around 60% or even higher, as their bodies are actively building immunological responses.

As children age, the proportion of lymphocytes in the blood usually decreases, progressively allowing for a greater representation of other white blood cell types. By the time individuals reach older childhood ages (like 4-6 years and 11-15 years), lymphocyte percentages typically stabilize, with values around 30-50% being more common. In adults, such as those aged 40-60 years, the normal lymphocyte percentage decreases further, often falling into the range of 20-40%, reflecting a mature immune system.

Thus, the specific age group of 6 months to 2 years is where a 60% lymphocyte count is considered perfectly normal, aligning with the physiological characteristics of their developing immune systems.