What Causes Aging, and Is It Natural?

Let me answer the first question the way I have answered it for patients for twenty years. What causes aging is wear and tear without repair. That is a Dr. Dave original, and yes, I expect to see it quoted on influencer sites soon enough. But it is also the most honest one-line summary of the biology you will ever read, because the place where the repair fails is exactly the place where you can change the dynamic of how fast you age.

Let me also be clear about something most longevity content tiptoes around. No one gets out of here alive. In all my years as a doctor I never once told a patient “I can save your life.” Even when I believed I could buy them years, there were always greater, more opaque powers at work. So when I talk about what causes aging, I am not selling you immortality. I am handing you the map of which levers actually move, and which ones do not.

Aging is natural. The speed of your aging is not fixed. Hold both of those in your head and you are already ahead of most people.

The Causes of Aging Are a Handful of Overlapping Failures

When researchers try to explain what causes aging, they keep landing on the same short list. The current science calls them the hallmarks of aging, and the foundational papers in Cell group them into a tight cluster of mechanisms that all feed each other (Lopez-Otin et al., 2013; expanded 2023). I have been describing this same intersection in my own posts for years as the integrative aspects of aging, the places where many different aging processes overlap and amplify one another.

Here is the short list that matters most, in plain language.

Nutrient sensing gone wrong. Your cells have sensors that decide whether to grow or repair based on how much fuel is coming in. Modern eating, constant calories, constant sugar, keeps those sensors stuck in the wrong position.

Telomere shortening and dysfunction. Telomeres are the protective caps on your chromosomes. Every time a cell divides they get a little shorter. When they get critically short, the cell stops repairing itself, and that is a central engine of aging. This is why telomeres sit at the crux of the whole aging story.

Stem cell depletion. Your repair crews run down. Fewer fresh cells means slower healing everywhere.

Mitochondrial dysfunction. Your cellular engines produce less clean energy and leak more damage as they age. I go deep on this in my piece on mitochondria and aging.

The global inflammation of aging. Chronic, low-grade, smoldering inflammation. I call it inflammaging, and it is so important it gets its own article.

None of these acts alone. Short telomeres drive inflammation. Inflammation accelerates mitochondrial decline. Mitochondrial decline starves your repair systems. That is the wear and tear without repair, running in a loop.

What Shortens Telomeres and Speeds the Whole Process

People ask me constantly what shortens telomeres, because that is the cause of aging they can feel the most control over. The honest answer is that almost everything hard about modern life does it. Chronic stress. Poor sleep. A blown omega-3 to omega-6 ratio. Visceral fat. Smoking. Crash diets and, ironically, crazy exercise endeavors like the Canadian Death Race I once ran through the Rockies.

Mother Nature and Father Time do not care whether you burned through your telomere reserve in a brutal residency program in your twenties or in a high-stress executive job in your fifties. The bill comes due either way. The science here is consistent and growing, and the lifestyle levers that protect telomeres are the same ones that show up again and again in the longevity literature (Fontana & Partridge, 2015).

That is the bad news. The good news is that it tells you exactly where to push.

Cellular Senescence: The Zombie Cell Problem

When a cell hits the end of its telomere clock, it does not always die cleanly. Sometimes it becomes senescent. I call these zombie cells, because they are dead and dying but they refuse to leave quietly. They sit in your tissues pumping out inflammatory signals that damage the healthy cells around them. Scientists call this the senescent associated phenotype.

Cellular senescence is the bridge between the telomere story and the inflammation story. It is why aging is fundamentally an inflammatory event, and it is one of the most actively researched targets in all of longevity science right now.

The Levers You Can Actually Pull

Here is where I earn my keep. Knowing what causes aging is useless unless you know which causes you can move. Some are genuinely easy.

Nutrient sensing. This one responds beautifully to intermittent fasting, and for healthy people, the occasional longer water fast. Provided you are healthy, a three to nine day water fast is the best cleanse on the planet, and you can skip every added pill during it. Just stay on your daily multi and your fish oil. Fasting also flips on autophagy and mitophagy, your cellular cleanup and mitochondrial recycling crews.

Inflammation. Also easy. Take enough fish oil to reverse the omega 3 to 6 imbalance most of us walk around with. Four to six grams does it for most people. One of my capsules is one gram, so do the math.

Telomeres. Telokynase is my high-potency telomere support, and telomere maintenance is one of the few things in this whole list where you can directly support the mechanism rather than just slowing the damage.

Stem cell depletion. This is the honest hard one. Despite every patch and potion that claims otherwise, you cannot meaningfully restore stem cell function at home today. Laser and red-light yourself all you like and let me know how it goes. Real stem cell work still means a direct infusion at a specialized clinic. I do not pretend otherwise.

If you want the foundational version of all of this in one daily system, that is exactly why I built my Immortality Edge Packs. They cover the nutrient, omega, and telomere-support layers in one stack, so the levers you can move are getting pushed every single day.

So, Is Aging Natural?

Yes. And so is doing something about it.

We are living in the first era of human history where you can genuinely change the dynamic of how you age. Not whether you age. The dynamic. The rate. The slope of the line. How much you change it is entirely up to you, and frankly, up to whether you believe it is possible and worth the effort.

I can only speak for myself. This is my life’s work. I run the tests on my own body first, I take the same fish oil and telomere support I put my name on, and I have watched my own biologic age move in the right direction over years, not weeks. Biology takes time. But the wear and tear without repair is not your destiny. It is a process with handles on it.

Grab the handles.

To your lasting energy and vitality, Doc

References

• Lopez-Otin et al., Hallmarks of Aging, An Expanding Universe, Cell (2023)
• Lopez-Otin et al., The Hallmarks of Aging, Cell (2013)
• Fontana & Partridge, Promoting Health and Longevity through Diet, Cell (2015)

Keep reading

• Telomeres: The Crux of Aging (start here)
• Inflammaging: how chronic inflammation speeds the clock
• Mitochondria and Aging
• Telomeres and Stress

— Doc