Cellular senescence
The cells that stop dividing but refuse to leave.
A senescent cell has stopped dividing but does not die. It stays put and continuously secretes a cocktail of pro-inflammatory molecules called the SASP, which damages neighboring tissue and pushes other cells toward the same state.
Often nicknamed zombie cells, they accumulate with age. Their burden in a tissue is now considered one of the best markers of local aging.
What this pillar covers
The SASP
The secretory phenotype of senescent cells: why a handful of cells is enough to inflame an entire tissue.
Senolytics
Fisetin, quercetin, dasatinib: where the research stands, what is established, and what is still confined to clinical trials.
Senomorphics
Rather than clearing senescent cells, quieting what they secrete: curcumin, polyphenols, glucose control.
Senescent burden
Joints, skin, vessels, fat tissue: where these cells accumulate most and show up earliest.
Why it matters
Senescence is the mechanism that links local aging to whole-body aging. A few senescent cells in one joint, and the entire organism sits in a low inflammatory background.
It is also the most promising hallmark in research. In animals, clearing senescent cells extends healthspan. In humans the first trials are under way and deserve to be followed with as much interest as caution.
A senescent cell does not just age. It ages its neighbors. This is contagion, not isolated wear.
Where to start
Stop making them
Glucose control, sun protection, sleep: first limit what pushes cells toward senescence.
Move and fast
The two main lifestyle levers associated with a lower senescent burden.
Stay clear-eyed on the rest
Senolytics generate legitimate excitement, but human protocols are not established. Follow the science without running ahead of it.