Buyer's guides
Choose by evidence, not marketing.
Longevity is full of confident claims. These guides cut through them with honest, sourced answers to the questions people actually ask before they spend money.
How to choose a biological age test
A plain guide to the ways your biological age can be measured, what each method actually tells you, and how to pick one you can act on rather than just read.
Read the guide →The biomarkers worth tracking for longevity
Not all bloodwork matters equally. The handful of markers that actually predict how you are aging, why each one counts, and the ranges to aim for.
Read the guide →Peptides for longevity, ranked by evidence
Peptides run from FDA-approved medicines to pure hype. How to tell the difference, which have real human evidence, and why the ones with the loudest marketing are often the least proven.
Read the guide →Educational only, not medical advice. Methodology at editorial standards.