What we actually measure when we measure aging.

Chronological age is a calendar number. Biological age is a description of the body that produced the calendar. Most longevity clinics that take the work seriously measure four families of markers at re-baseline, and we are no exception.

1 · Methylation clocks

The methylation clock, Horvath's was the first, GrimAge and DunedinPACE are now the more accurate descendants, reads a small set of CpG sites in the genome and infers a biological age. It is a derived number, not a measurement of any single organ, and it should be treated as a trend line rather than a verdict. A single test in isolation is noise. Two tests, twelve months apart, on the same panel, in the same lab, start to mean something.

Our genetic-testing service handles methylation reads in-house, alongside the SNP panel and the pharmacogenomic profile. We re-run the methylation clock every twelve months for long-term clients and look at the slope, not the absolute number.

2 · Inflammaging markers

Chronic low-grade inflammation is one of the load-bearing pillars of every aging-mechanism paper of the last decade. We measure high-sensitivity CRP, IL-6 when indicated, ferritin, fibrinogen and homocysteine on every re-baseline. None of these is dispositive alone, but a stable pattern of high-normal hs-CRP and rising IL-6 across two cycles is a signal worth acting on.

Where inflammation panels read elevated, the intervention is usually upstream of the lab, sleep, body composition, dental health, alcohol, before it is downstream in the form of a therapy. When the upstream work is in hand and the markers still drift, that is when our MSC programme becomes a sensible next step, because immunomodulation is what mesenchymal stem cells primarily do. The mechanism is covered in how effective is MSC if you want the cellular biology.

3 · The metabolic panel

Fasting glucose, fasting insulin, HOMA-IR, HbA1c, an extended lipid panel (ApoB and Lp(a), not just LDL-C), a thyroid panel, and a vitamin and mineral micronutrient read. Of all four families, this is the one that responds fastest to behaviour change, and the one where a quiet, well-built vitamin-therapy programme earns its keep, addressing depletions the diet alone is not closing.

Cardiologists pay particular attention to ApoB and Lp(a) because they are the lipid measurements most predictive of cardiovascular events at the time horizons longevity programmes care about. Our cardiology consultant, Dr. Sukawit Limwananon, reviews any client whose lipid pattern is worth a sit-down conversation rather than a print-out.

4 · Functional and body-composition reads

Grip strength, VO₂ max where the client can produce one, DEXA-derived lean mass, visceral adipose tissue, and resting heart-rate variability. These four together describe whether the body is moving in the direction the labs claim it is. Lab values without functional reads can flatter a client into a false sense of progress.

Putting it together

No single number changes a protocol. A consistent pattern across all four families does. We share the full panel with every client at re-baseline, with the absolute values, the trend lines from prior visits, and the clinician's read in plain language. Then we agree, together, on the smallest set of interventions that should change before the next visit.

If you have done none of this work before, the next read on this list is the longevity stack, where supplements end and clinical care begins. It covers what to fix yourself before booking a flight to Bangkok.