ageing is associated with a 
  decline in the normal function of the immune system, leading to increased 
  susceptibility to various diseases and shortened longevity. 
</p>
<p>
&ldquo;However, specific dysfunctions in the immune system directly responsible for 
  this have yet to be identified. 
</p>
<p>
&ldquo;Among the important factors, T cells are central to the immune response, and 
  their function is significantly altered with increasing age." 
</p>
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