Getting older is the biggest risk factor for many chronic diseases.
Heart disease, type 2 diabetes, dementia, cancer and several other conditions become more common as we age.
But why?
Part of the answer may lie in the biology of aging itself.
Aging and disease can share the same biology
Scientists describe many of the biological changes that occur with aging through the Hallmarks of Aging.
These include DNA damage, changes in gene regulation, mitochondrial dysfunction, cellular senescence, chronic inflammation and other processes.
These changes are part of aging biology. But many of them are also involved in diseases that become more common later in life.
That overlap is important.
It suggests that aging and age-related disease are not completely separate biological stories.
Different diseases can involve different aging processes
A recent analysis compared the Hallmarks of Aging with genes involved in several diseases.
Diseases associated with aging showed stronger links with aging hallmarks than developmental and congenital diseases.
The patterns also made biological sense.
For example, Alzheimer’s disease was strongly linked with loss of proteostasis — problems with the systems cells use to maintain, process and remove proteins.
This is relevant because abnormal protein accumulation is an important feature of Alzheimer’s disease.
Atherosclerosis, which underlies many heart attacks and strokes, showed a close connection with chronic inflammation.
Again, this fits with what we already know: inflammation plays an important role in the development and progression of atherosclerosis.
One disease can involve several aging mechanisms
The relationship is not as simple as:
one hallmark = one disease.
A disease may involve several aging-related processes at the same time.
Likewise, one biological process — such as chronic inflammation — may contribute to several different conditions.
This is one reason researchers increasingly study aging as a connected biological system rather than looking at every mechanism and every disease entirely separately.
Does aging cause these diseases?
Not in a simple, direct way.
Growing older does not mean that someone will inevitably develop Alzheimer’s disease, cardiovascular disease or diabetes.
Genetics, lifestyle, environment and many other factors also matter.
But biological changes associated with aging can make our cells and tissues more vulnerable to disease.
Understanding those changes may therefore help explain why the risk of many different diseases rises with age.
Why does this matter for healthy aging?
The goal of healthy aging is not simply to live longer.
It is to spend more years without major disease, disability and loss of independence.
Understanding the shared biology of aging and chronic disease may help researchers identify mechanisms that are important for several conditions rather than for only one disease.
It also reinforces something we already know from prevention: protecting cardiovascular and metabolic health, staying physically active and reducing major risk factors can have benefits across many areas of health as we age.
Based on Research
Tiwari R, Balaji M, Chivukula N, Sil P, Samal A. An integrated resource for systems-level analysis of aging hallmarks and associated genes. 2026.
