Your Immune System Gets Old Too — And Here’s What That Means

As we age, our immune system doesn’t just slow down — it actually changes in ways that affect our health in very real, measurable ways. This is why we need to pay attention to our immune system and inflammaging.

Why Your Immune System is Key to Longevity

Dr Craige Golding, a leading specialist aging medical doctor, and educator, recently gave a presentation to a professional audience. We posted the full presentation on our website recently.  You can find the link to the full presentation in the references below. I thought it would be helpful to focus on the two key ideas he presented and provide a summarized version of a very detailed and fascinating presentation.

Two key ideas that will change the way you look at your health

Immunosenescence — the immune system gradually becoming weaker and less able to fight off new threats.

Inflammaging — a low-grade, chronic state of inflammation that quietly simmers in the background, contributing to a wide range of diseases.

These two processes feed each other in a vicious cycle.

Why Does This Happen?

Several things drive immune aging:

• The thymus gland (where immune cells are “trained”) shrinks with age, producing far fewer new immune cells by the time we’re 60.
• Stem cells in the bone marrow shift toward producing more inflammatory cells and fewer of the adaptive immune cells we need.
• Lifelong infections (like the common herpes virus CMV) wear out the immune system over time.
• Senescent cells — old, dysfunctional cells that refuse to die — leak inflammatory chemicals into the body.
• Metabolic changes in aging cells trigger more inflammation from within.

What Are the Real-World Consequences?

• More infections, and more severe ones — over 80% of COVID-19 deaths were in people over 60.
• Vaccines work less well in older adults, which is why higher-dose flu shots exist for people over 65.
• Autoimmune diseases like late-onset rheumatoid arthritis become more common.
• Cancer risk rises because the immune system is less able to detect and destroy abnormal cells.
• Infections may present differently in older people — confusion instead of fever, for example — making diagnosis harder.

How Can We Measure Immune Age?

Doctors can use several markers to assess how “old” someone’s immune system actually is:

• IL-6, CRP, and TNF-α — inflammatory proteins that rise with age.
• Neutrophil-to-Lymphocyte Ratio (NLR) — a simple blood count calculation that reflects immune stress.
• CD4/CD8 T-cell ratio — an inverted ratio signals a more aged immune profile.
• iAge — an AI-powered “inflammatory aging clock” that uses a panel of immune markers to calculate biological immune age.

What Can We Do About It?

Medications (some are still experimental):

• Rapamycin/Everolimus — mTOR inhibitors that have been shown to improve vaccine responses in older adults by about 20%.
• Metformin — the common diabetes drug also reduces immune exhaustion and inflammation.
• Senolytics — drugs that clear out senescent cells, potentially resetting inflammation levels.
• Immunity modulators like IL-7 therapy — these can help “restock” the immune system with fresh cells.
• Other agents like supplements –  Zinc supplementation (if deficient) improves immune function and lowers infection risk; Vitamin E showed improved NK cell function in elderly in past trials. Thymic peptides (like thymosin α1) are used in some countries to enhance T-cell immunity in aged individuals.

Lifestyle (accessible to everyone, and highly effective)

• Exercise is arguably the single most powerful immune anti-aging tool — even starting in your 70s makes a difference.
• Mediterranean-style diet lowers inflammation and supports immune health.
• Probiotics and fibre help maintain a healthy gut microbiome, which directly influences the immune system.
• Sleep (7–8 hours) is when the immune system does much of its repair work.
• Stress reduction through yoga, meditation, or social connection lowers inflammatory markers.
• Quitting smoking and limiting alcohol both meaningfully improve immune function.

What’s Coming Next?

Research is moving fast. Future possibilities include (but not limited to):

• Better vaccines designed specifically to overcome an aged immune system.
• Thymus regeneration therapies to restore the production of new immune cells.
• Plasma exchange to remove pro-inflammatory compounds from the blood.
• Combination protocols — similar to how HIV is managed — that target immune aging from multiple angles at once.

How well do you want to age?

Immune aging is real, measurable, and — to a significant extent — manageable. It’s not an inevitable cliff. With the right lifestyle habits, appropriate vaccinations, monitoring of key biomarkers, and emerging therapies, we can keep the immune system functioning more like a younger person’s — and that could make a profound difference to how well we age.

Key reference: Immune aging and the key biomarkers of aging

Interested in understand this in more detail?  Read the full article click here: Immune Aging and The Key Biomarkers of Longevity