Mixed
Physiological aging in humans is characterized by the accumulation of unrepaired DNA double-strand breaks (DSBs) in hematopoietic stem and progenitor cells, driven by a decline in DSB repair capacity rather than telomere shortening.
Your body's ability to repair DNA damage declines with age, leading to accumulated genetic errors in blood stem cells. However, this process is not fixed; individuals with healthy lifestyles maintain higher repair efficiency and lower damage levels even in their 70s. Focus on lifestyle factors that support cellular repair mechanisms rather than accepting damage as inevitable.
Analyzing CD34+ and CD342 stem/progenitor cells we observed an increase of endogenous cH2AX-foci levels with advancing donor age... suggesting that age-related non-telomeric DNA damage accrual accompanies physiological stem cell aging in humans.
Why this rating
Large sample size (n=68 healthy donors) and rigorous immunofluorescence methodology, but observational in nature.
Source
Accumulation of DNA Damage in Hematopoietic Stem and Progenitor Cells during Human Aging
Claudia E. Rübe et al. · PLoS ONE · 2011
DOI 10.1371/journal.pone.0017487
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