Tejal Somvanshi
Liz Earle’s appearance in the October Women’s Health UK issue and its accompanying podcast, both released September 22, has drawn attention to her longevity routine and a biological age test result she says put her at 39. The figure is striking—but the habits behind it range from well-supported lifestyle interventions to personal wellness practices with considerably less established evidence.
Earle, who is 63, was interviewed for the Women’s Health podcast “Just As Well, The Women’s Health Podcast” and the October print issue. She said tests suggested a biological age of around 39. The podcast was published September 22 and is available on Apple Podcasts and other platforms.
A biological age result is an estimate produced by a particular test—not a medical diagnosis or a validated prediction of lifespan. Some biological age tests use biomarkers to estimate cellular ageing, but the specific method Earle used has not been confirmed in the sources reviewed here. Different testing methods can produce different results from the same person.
Earle’s discussion covered morning light exposure, strength training, protein intake, creatine and collagen supplementation, hormone replacement therapy, and regular movement. These practices carry meaningfully different levels of scientific backing. Readers interested in healthy ageing should understand which interventions have strong, consistent evidence behind them and which are personal wellness choices that may or may not produce the same results.
Which Habits Have the Strongest Evidence
Resistance training is well supported for maintaining muscle strength, physical function and bone health as people age. Broad health guidance consistently includes regular resistance exercise as a priority for older adults. For an overview of how to build a strength training routine for healthy ageing, see .
Many experts recommend higher protein intakes for older adults, particularly when maintaining muscle is a goal. Creatine has solid evidence for supporting muscle function, particularly in older adults doing resistance training.
Hormone replacement therapy has a more complex evidence picture. It is recognised by major clinical bodies as appropriate for managing menopausal symptoms and has been the subject of recent research into broader health effects in postmenopausal women. For a detailed breakdown of current HRT guidance, see .
Collagen supplementation is widely used but the research base is less consistent than for strength training or protein adequacy. The body of evidence is growing but has not reached the same level of consensus. Earle’s book “How to Age,” which she describes as based on her interpretation of scientific papers and longevity practices, should not be treated as a substitute for medical guidance.
The most informative detail from Earle’s Women’s Health appearance is not the biological age number itself but the breadth of the routine—and the fact that it combines interventions with strong clinical evidence alongside personal practices that readers may adopt without realising the evidence behind them varies considerably. That distinction is worth making before drawing any personal conclusions from a single person’s test result.
What is Liz Earle's biological age?
Liz Earle has said that tests suggested a biological age of around 39 at age 63. That is a personal test result, not a medical determination of overall health or expected lifespan. Biological age tests estimate cellular markers and results vary by method and individual.
Earle’s book “How to Age” is available through the Liz Earle Wellbeing platform. The Women’s Health UK October issue and the podcast episode are available now.
