While the thymus gland does shrink down in size as a person reaches adulthood, it does not mean that adults stop producing T lymphocytes altogether. The thymus gland is an important site of T cell development, and while its size and function decrease with age, it continues to produce T cells throughout adulthood.

In fact, some studies suggest that the T cell response in adults may be more robust than in children, possibly due to the accumulation of memory T cells over time. However, the overall number of T cells in the body may decline with age, and the T cell response may be less efficient in older adults.

It's also worth noting that other organs and tissues in the body, such as the spleen and lymph nodes, also contribute to T cell production and function. So while the thymus gland is an important site of T cell development, it is not the only source of T cells in the body.
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