blood biomarker testing

The concept of “biological age” has officially entered the mainstream.

From podcasts to TikTok to wellness newsletters, everyone seems to be talking about how old they really are — not by the number of birthdays they've celebrated, but by what’s happening inside their cells. Biological age testing promises to reveal how well you're ageing, whether your efforts to eat better, sleep more, or reduce stress are “working,” and whether you're adding years to your life — or life to your years.

And the appeal is obvious. In a world that’s increasingly focused on prevention and performance, the idea of quantifying your ageing process is both empowering and seductive. A simple test, a bold number, and the reassurance (or wake-up call) that you’re either thriving or falling behind.

But here’s the thing: while the science behind biological age is fascinating, these tests might not be telling you what you really need to know.

What Is Biological Age — and Can It Be Measured?

Biological age