The 12 Hallmarks of Aging: The New Map of Aging

At Image Regenerative, we observe every day how aging has ceased to be an immutable destiny to become a biological process that science can now describe, measure, and partially direct.

From this vision arise the regenerative medicine pathways and longevity protocols we offer at our Milano and St. Moritz locations, where we combine international research with clinical solutions tailored to each individual.

These include NAD intravenous therapy dedicated to longevity, designed to support cellular energy, along with regenerative approaches based on micro-fragmented adipose tissue using the Lipogems® method.

Understanding the hallmarks of aging, the distinctive signs of cellular aging, offers a precise map of what happens in the body over time, as we have already explored when examining the biological mechanisms that regulate skin aging.

What are the hallmarks of aging?

The hallmarks of aging are common and measurable biological traits that accompany aging across different species, from humans to simpler organisms. The concept was introduced in 2013 by Spanish biochemist Carlos López-Otín along with an international group of researchers, who identified nine distinctive signs.

In 2023, in light of ten years of new evidence, the same group expanded the map to twelve elements in the study Hallmarks of Aging: An Expanding Universe, published in the scientific journal Cell.

For a process to enter this list, it must satisfy three rigorous criteria: manifest with age, accelerate aging when accentuated in the laboratory, and offer the possibility of slowing, stopping, or reversing decline when intervened upon.

It is precisely this third criterion that makes the map so valuable for longevity medicine, as it transforms cellular aging from an abstract concept into a set of concrete targets to work on. Studying these markers allows us to understand what changes in the body with the years and, most importantly, where it is possible to act to preserve its function.

The twelve distinctive signs of aging

The twelve markers are grouped into three families that help read their role. Primary signs represent the sources of cellular damage. Antagonistic signs are the responses that the body puts in place to defend itself and which, over time, become damaging themselves.

Integrative signs, finally, are those that translate into the visible decline of tissues and functions.

These twelve elements act in an interconnected way and influence each other, creating a network where each alteration tends to amplify the others. This is why research prefers to look at the whole system rather than a single isolated factor.

Cellular senescence and genomic instability

Among the distinctive signs, genomic instability occupies a central place. Every day the DNA of our cells undergoes thousands of small damages, caused by radiation, oxidative stress, errors during duplication, and external agents. The body has sophisticated repair systems, but with age their efficiency decreases and errors accumulate, compromising proper cellular function.

To this is added the shortening of telomeres, the protective caps at the ends of chromosomes that wear down with each division, signaling to the cell when it is time to stop.

Closely related is cellular senescence. When a cell accumulates too much damage, it can enter a particular state where it stops dividing while remaining metabolically active. These senescent cells, often described as zombie cells, release inflammatory molecules that alter the surrounding environment and contribute to that chronic low-grade inflammation that researchers refer to as inflammaging.

Their excessive accumulation favors the appearance of numerous age-related conditions. This is why research is studying senolytics, molecules that selectively target senescent cells promoting their disposal, along with strategies that support natural DNA repair mechanisms.

How mitochondria influence aging

If we look for an engine of aging, we find it in mitochondria, the structures that produce the energy necessary for every cellular activity.

Over the years these organelles lose efficiency, generate less energy, and release a greater quantity of free radicals, fueling oxidative stress that in turn damages DNA, proteins, and membranes. A cycle is thus created in which mitochondrial dysfunction worsens other distinctive signs and accelerates overall decline.

In this scenario, NAD plays a leading role, namely nicotinamide adenine dinucleotide, an essential molecule for energy production and for the activation of sirtuins, proteins that regulate DNA repair and cell health. NAD levels tend to decrease with age, and this decline is reflected in reduced sirtuin activity and less performing mitochondria.

Supporting NAD availability is today one of the most studied strategies to counteract cellular aging and preserve tissue vitality, and it is one of the pillars on which we build our longevity pathways.

From theory to practice: acting on aging

The strength of this map lies in translating into concrete actions. Scientific evidence indicates several levers capable of influencing the distinctive signs of aging: a careful lifestyle, balanced nutrition, and good stress management remain the foundations, accompanied by targeted interventions such as NAD modulators, senolytics, and strategies that reduce chronic inflammation.

In our clinical practice these principles take shape in personalized protocols, always under medical supervision. NAD intravenous therapy works on cellular energy and mitochondrial function, regenerative phlebotherapies support microcirculation and body balance, while the Lipogems® method exploits the natural potential of micro-fragmented adipose tissue to stimulate tissue regeneration processes, an aspect that directly addresses the distinctive sign related to the exhaustion of cellular regenerative capacities.

While traditional medicine often intervenes on individual symptoms, the regenerative approach we have chosen works upstream, on the cellular mechanisms that aging challenges, with the aim of visibly improving tissue quality and slowing functional decline over time.

Why this map changes longevity medicine

Until a few years ago, medicine addressed individual age-related diseases separately. The map of the twelve distinctive signs proposes a radical change of perspective: acting on shared upstream mechanisms, instead of chasing consequences one by one. This shifts attention from simply life duration to its quality, what scholars call healthspan, that is, years lived in good health.

This results in a more preventive, personalized, and measurable longevity medicine, capable of reading specific biomarkers and building tailored pathways for each patient. It is the direction we follow every day, integrating international research with clinical experience gained in regenerative medicine.

Understanding how we age becomes the first step in taking care of ourselves consciously, and specialized consultation allows identifying the most suitable strategies for each person's history and goals.

Frequently asked questions

What are the twelve hallmarks of aging?

The twelve distinctive signs of aging are genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, disabled macroautophagy, deregulated nutrient sensing, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, altered intercellular communication, chronic inflammation, and dysbiosis. They were defined by López-Otín and colleagues and updated in 2023 in the journal Cell.

What is the difference between chronological aging and biological aging?

Chronological aging simply measures the years elapsed since birth. Biological aging instead reflects the actual state of cells and tissues, which may be younger or more advanced than chronological age depending on genetics, lifestyle, and environment. The distinctive signs of aging help precisely assess this biological age.

Is it possible to slow cellular aging?

Scientific evidence shows that it is possible to counteract and slow various cellular aging mechanisms through lifestyle, nutrition, stress management, and targeted interventions such as regenerative protocols and NAD modulators.

The realistic goal is to preserve tissue health and functionality longer, acting on the biological mechanisms that time challenges.

What role does NAD play in aging?

NAD is an essential molecule for energy production and for activating sirtuins, involved in DNA repair.

Its levels decrease with age, reducing mitochondrial efficiency. Supporting its availability, for example through targeted medical infusion protocols, is today one of the most studied strategies to support cellular energy and promote healthy aging (healthspan).