the.com/cellular aging
your cells keep a diary of every birthday, and they never learn to lie.
means the gradual decline in cells' ability to divide, repair, and function properly as damage accumulates over time.
from biologists noticed in the 1960s that human cells in a petri dish stopped dividing after about 50 replications, a limit named the hedayflick limit after leonard hayflick, who upended the belief that cells were immortal.
telomeres shrinkeach division clips protective chromosome caps a little shorter
senescent cellszombie cells that refuse to die or divide
reversible sometimesyamanaka factors can partially reset cell age in labs
not just clockstress and damage matter more than years passed
for instance
hayflick limit — 1961 discovery that human cells divide roughly 40-60 times
progeria — genetic disease causing extreme aging by age 10
telomerase therapy — experimental drugs targeting the enzyme that rebuilds telomeres