Reversing Biological Age in Practice: 7 GlycanAge Case Studies Where Patients Dropped 10+ Years

Biological age, as measured by GlycanAge, reflects how fast your immune system is aging, not how many years you have lived. GlycanAge analyses 29 glycan structures (complex sugars) attached to Immunoglobulin G (IgG) antibodies, calculating the ratio of pro-inflammatory to anti-inflammatory glycans to produce a biological age score distinct from chronological age. A 10-year reduction in that score means the immune system has shifted measurably toward a less inflammatory, more resilient state. This change is visible in the molecular data before it is visible in symptoms.

These are not hypothetical projections. The cases below are drawn from clinical practice and published data, each illustrating how targeted interventions, such as hormone therapy, lifestyle restructuring, metabolic optimization, register as real biological change when measured through glycans.

Want to understand exactly how this measurement works, from what glycans are to how the score is calculated? Read our article Biological Age Testing: The Complete Guide to Measuring How Fast You're Actually Aging for the full breakdown.

How do we know these results are real and not just measurement noise?

GlycanAge results are real when they exceed the test's natural variability, which is approximately 1 year between repeat measurements in the same individual with no biological change. That stability is what makes a 10-year shift meaningful: it cannot be explained by analytical noise.

Independent research by Alden Scientific found that GlycanAge remained consistent within a 1-year range in repeat measurements. By comparison, published epigenetic clocks report population-level median errors of roughly 2.3 to 3.6 years in external validation studies, with some original models running higher still — a pattern Prof. Riccardo Marioni described directly in discussing his own team's work in this space. In longitudinal data, glycan profiles in individuals with no major lifestyle or health changes stayed stable over time, while individuals who underwent meaningful physiological events showed clear directional shifts in their glycan markers. A 10-year reduction is not noise. It is a signal.

Case 1: Switching HRT formulation dropped biological age by 10 years in 12 months

A 55-year-old woman, four years post-menopause, was already taking oral estrogen–progesterone therapy when she presented at a longevity clinic in New York City. Despite a disciplined lifestyle and strong metabolic health, she continued to experience poor sleep, joint aches, and vaginal dryness. Her GlycanAge was elevated above her chronological age, indicating accelerated immune aging not fully addressed by her current treatment.

Her clinicians transitioned her to a bioidentical estradiol cream with gradual dose adjustments. Over the following 12 months, her GlycanAge decreased by 10 years. That change wasn't something she could feel or report. It only showed up when the immune system itself was measured. The case illustrates a point that matters for clinical practice: symptom relief and biological restoration are not the same thing, and GlycanAge can distinguish between them.

Case 2: Patient new to hormone therapy reduced biological age by 11 years in one year

A 56-year-old woman arrived at the same clinic six years after menopause, having never used hormone therapy. She presented with severe depression, chronic fatigue, and weight gain. Her GlycanAge was markedly higher than her chronological age, reflecting the cumulative toll of untreated menopause on immune and systemic aging.

Her care team initiated a comprehensive regimen of transdermal estradiol, testosterone cream, oral DHEA, and progesterone. Within three months, her GlycanAge had reduced by 8 years. After 12 months, the reduction reached 11 years. Alongside the biomarker changes, her mood, energy, and overall function improved significantly. The speed of the initial response — 8 years in 90 days — reflects how rapidly glycan profiles can shift when the underlying hormonal deficit is addressed directly.

"Women who were supplemented with estradiol didn't develop increasing chronic inflammation or a rise in biological age. But the women who were depleted of their sex hormones — put into a state of menopause with no hormonal treatment — aged an average of nine years in just six months. Some aged as much as fifteen."

— Dr. Julija Jurić, Genos Glycoscience Research Laboratory

Case 3: A high-pressure executive reduced biological age by 10 years in six months

A 32-year-old male client at a partner longevity clinic presented with a demanding executive lifestyle that left little room for consistent recovery or routine. His baseline GlycanAge test, taken in March 2025, returned a biological age of 49, which was 17 years above his chronological age, driven by a heightened inflammatory burden and reduced immune repair capacity.

Using the GlycanAge AI Interpretation Assistant, his care team identified specific, targeted levers: refining his diet to reduce inflammatory foods and improve omega ratios, adjusting his training approach to better match his hormonal state, improving evening light exposure and recovery routines, and increasing structured daily movement. Over the following six months, he implemented these changes. His follow-up test in October 2025 returned a biological age of 39 — a 10-year reduction. The case illustrates how glycan-level feedback can convert general lifestyle advice into a specific, trackable protocol, rather than a one-size-fits-all recommendation.

Case 4: A 71-year-old male tested with a biological age of 20

At a longevity clinic running a comprehensive metabolic and hormonal optimization program, the largest single result recorded was a 71-year-old male whose GlycanAge came back at 20 — a 51-year gap between biological and chronological age.

"We've analyzed over 100 people from Joseph's practice, and they're all turning out to be younger — 15, 20, 30 years younger than their chronological age."

— Prof. Gordan Lauc, PhD, Co-Founder and CSO, GlycanAge

The clinic's approach combined metabolic health optimization, low body fat targets, structured exercise, and hormonal management. This cumulative program was built over years of patient care. The attending physician noted that new patients entering the program typically start near their chronological age, then see their biological age drop as the program takes effect, confirming that the results reflect genuine biological change rather than patient selection.

Case 5: Testosterone therapy in obese men produced a significant biological age reduction

In a study of obese men with no chronic or reported illnesses, testosterone replacement therapy led to a significant reduction in GlycanAge over 12 months, reflected in a more anti-inflammatory glycan profile. The placebo group showed no meaningful change over the same period. While the effect size in men is generally less pronounced than in menopausal women, the direction is consistent: restoring hormonal balance reduces chronic inflammation as measured through glycans.

Case 6: An NAD+ supplement reduced biological age by 1.26 years in 28 days

A double-blinded, placebo-controlled crossover trial of the NAD+ supplement Nuchido TIME+ enrolled 26 healthy participants aged 21–72. Those receiving the supplement experienced an average GlycanAge reduction of 1.26 years after 28 days. Participants receiving the placebo showed no equivalent change. The result is modest in absolute terms but significant in what it demonstrates: a supplement effect measurable through glycans in under a month, in a controlled trial design that rules out placebo response. Not all supplements produce this effect, and GlycanAge can identify which individuals are responding and which are not.

Case 7: Leaving a high-stress corporate role reduced biological age by 18 years

Longitudinal GlycanAge data from a single individual, measured one year apart, tells a striking story. At the second measurement, their biological age was 21 — 18 years younger than their chronological age of 39. This followed a transition out of a high-stress corporate career into a more fulfilling solo role. In the absence of any other major health intervention, the shift points to how stress ages the immune system as a direct driver of immune aging and its removal as a measurable biological event.

This pattern is consistent with the broader longitudinal data: glycan profiles remain stable when life circumstances are stable, and shift directionally when meaningful physiological or psychological events occur.

What do these cases have in common?

Across all seven cases, the interventions that produced the largest biological age reductions addressed the root drivers of chronic inflammation directly — hormonal deficits, circadian disruption, metabolic dysfunction, and sustained psychological stress. GlycanAge did not prescribe those interventions; it measured whether they were working at the immune level, providing objective data that neither symptom reports nor standard blood panels could supply.

Published research links higher GlycanAge and pro-inflammatory glycan traits to increased all-cause mortality and dementia risk at a population level. Preliminary data from a large-scale UK Biobank analysis suggests that combining chronological age, standard blood biomarkers, and IgG glycans improves the prediction of both healthspan and lifespan beyond any single measure alone.

GlycanAge is not a diagnostic tool and does not predict individual risk, but these population-level associations are why glycan-level change matters: these cases are not anecdotes about feeling better, they are data points in a measurement system with a documented relationship to long-term health outcomes.

If you want to know where your own biological age sits, and whether your current interventions are registering at the immune level, the GlycanAge at-home test gives you that baseline. Every test includes a 1:1 Result Interpretation Call with a longevity specialist who will walk you through your glycan indexes and what they mean for your health strategy.

Measure what's actually changing. Order your GlycanAge test kit

External sources

• https://pubmed.ncbi.nlm.nih.gov/24325898/ — Krištić J, Vučković F, Menni C, Klarić L, Keser T, Beceheli I, et al. Glycans are a novel biomarker of chronological and biological ages. J Gerontol A Biol Sci Med Sci. 2014;69(7):779–789.

• https://pubmed.ncbi.nlm.nih.gov/34285147/ — Kifer D, Louca P, Cvetko A, Deriš H, Cindrić A, Grallert H, et al. N-glycosylation of immunoglobulin G predicts incident hypertension. J Hypertens. 2021;39(12):2527–2533.

• https://pmc.ncbi.nlm.nih.gov/articles/PMC9976489/ — Bernabeu E, McCartney DL, Gadd DA, Hillary RF, Lu AT, Murphy L, Wrobel N, Campbell A, Harris SE, Liewald D, Hayward C, Sudlow C, Cox SR, Evans KL, Horvath S, McIntosh AM, Robinson MR, Vallejos CA, Marioni RE. Refining epigenetic prediction of chronological and biological age. Genome Medicine. 2023;15(1):12.