There are several core biological processes that, together, drive the gradual loss of tissue function and increased disease risk as we grow older. Think of these porcesses of aging as a simple map showing the main ways our bodies change over time. Instead of the vague perspective we hold that aging means, “we just fall apart,” understanding exactly how we age and develop disease gives us hope and direction to create health change.
Naming the processes—like DNA wear and tear, tired cell powerhouses (mitochondria), slower cellular clean‑up (autophagy), low‑grade inflammation, and shifts in the gut microbiome—that together lead to loss of function and more health problems as we get older is helpful to understand what is is we are trying to prevent, slow down or fix.
These processes of aging were coined “hallmarks” when they were described in a famous academic article by Lopez-Otrin in 2013 ( and subsequently updated as we have learned more over the years)
I’m sharing these insights with you, hoping they’ll illuminate the intricacies of the aging process. My aim is for you to utilize this framework, perhaps in collaboration with your healthcare practitioner, to proactively address pertinent aspects of your own health.
Below are López‑Otín et al.’s original nine hallmarks of aging (2013), updated to include additional processes commonly discussed in recent literature.
Genomic instability
What it is: DNA accumulates damage from time, environmental exposures, and copying errors.
Plain terms: Your genetic “blueprint” gets more mistakes over time, which can make cells work poorly.
Telomere attrition
What it is: Protective chromosome ends (telomeres) shorten with each cell division.
Plain terms: Like shoelace tips wearing down, chromosomes become less stable and cells stop dividing normally.
Epigenetic alterations
What it is: Chemical tags that turn genes on or off change with age.
Plain terms: It’s like sticky notes on your genes shifting over time so the wrong instructions get followed or useful ones are ignored.
Loss of proteostasis
What it is: The systems that fold, repair, and remove proteins become less effective.
Plain terms: Proteins misfold or pile up like kitchen clutter, disrupting cell function.
Deregulated nutrient sensing
What it is: Key nutrient‑sensing pathways become imbalanced.
Plain terms: The body’s “fuel gauge” and growth managers stop responding properly, affecting repair and metabolism.
Mitochondrial dysfunction
What it is: Mitochondria produce less energy and more damaging byproducts.
Plain terms: Cells lose power and produce more “exhaust” that harms cell parts.
Click here to read more about Mitochondrial health
Cellular senescence
What it is: Cells stop dividing and release inflammatory signals that affect nearby cells.
Plain terms: Old cells become noisy neighbors — they don’t work properly and they release factors that disturb tissues.
Stem cell exhaustion
What it is: The pool of stem/repair cells declines in number and function.
Plain terms: Fewer repair workers are available, so tissues heal and renew more slowly.
Altered intercellular communication
What it is: Cell‑to‑cell signaling (hormones, immune signals) becomes disrupted and often more inflammatory.
Plain terms: Cells stop “talking” well to each other — messages get garbled and inflammatory chatter increases.
Additional, recently emphasized processes:
Decline in autophagy (cellular housekeeping)
What it is: Autophagy — the process that clears damaged cell parts and recycles them — becomes less efficient with age.
Plain terms: The cell’s garbage‑and‑recycling service slows down, so broken parts accumulate and cells function worse.
Inflammaging (chronic low‑grade inflammation)
What it is: A persistent, mild inflammatory state driven by senescent cells, immune aging, and metabolic changes.
Plain terms: The body lives with a low hum of inflammation that slowly damages tissues and raises disease risk.
Click here to link to Chronic Inflammation blog
Gut dysbiosis and microbiome changes
What it is: Age‑related shifts in the gut microbial community composition and function, often with reduced diversity and more harmful species.
Plain terms: Your gut “garden” changes over time — helpful microbes decline and more problematic ones can take over, affecting digestion, immunity, inflammation and even brain health.
Click here to read about gut dysbiosis and ‘leaky gut’
A Map of Aging- how the pieces fit together
In reality, these hallmarks all impact and affect one another, meaning that aging is a complex process driven by many processes rather than one or two hallmarks.
For example:
Damaged DNA can push cells into a worn‑out state called senescence. Those senescent cells — along with a slowdown in the cell’s clean‑up system (autophagy) — create a low, persistent inflammation (“inflammaging”). Changes in the gut microbiome can amplify that inflammation and disturb metabolism, while tired mitochondria (the cell’s powerhouses) leave less energy available for repair. In short, aging is a web of interacting problems, not a single cause — each change feeds the others.
Why it matters
Creating a clear map of how we age helps us take a proactive, hopeful approach to staying vital and functional as we grow older. It empowers you to make different lifestyle choices now—and to seek medical guidance and appropriate testing—so you can consider targeted medical, lifestyle and nutraceutical strategies when helpful.
