As human cells age, the packaged form of DNA within the cell nucleus, known as chromatin, undergoes structural degradation and physically opens up. This alteration causes older cells to respond weakly or incorrectly to external mechanical and biochemical stimuli, leading to impaired cellular function.
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https://www.sflorg.com/2026/03/mbio03262601.html
Why cells respond “incorrectly” in old age

Some of the signs of ageing in human cells originate in the cell nucleus, because the packaged form of DNA changes with age.