Can you really lower your biological age, and does the research support this?
There are promising indications that biological age is measurable and perhaps controllable, but clinical evidence that you can truly and lastingly lower that age is still lacking. Wait for larger studies before basing major decisions on this.
Biological age can now be measured using epigenetic clocks. These are measurement tools that look at chemical tags on your DNA that change as you grow older. Well-known examples include the Horvath clock, PhenoAge and GrimAge. They demonstrably predict your risk of disease and death, making them useful as risk indicators, though not yet proven steering instruments.
Whether you can actually lower that biological age is a question very much under investigation, but one that remains unanswered. A review of the field1 describes the results as promising, yet the authors are explicitly cautious. The studies are often small or methodologically weak. Hard conclusions about which supplement, diet or treatment works cannot yet be drawn.
A striking example of experimental research is a mouse study2. Researchers used a temporary mRNA therapy targeting the liver to restore immune signals. This led to improved production of immune cells, stronger responses to vaccines and better antitumour immunity. The effects were also reversible after the treatment was stopped. However, this has been demonstrated in mice only. Whether it works in humans is entirely unknown.
In practical terms, there is currently no intervention with clinical proof that it significantly and lastingly lowers your biological age. The measurement tools exist, the first mechanistic clues are there, but the step toward solid clinical confirmation has not yet been taken. Products or programmes that do promise this are running far ahead of what the research justifies so far.
Based on two sources: a review on epigenetic clocks and lifestyle interventions (PMID 36206857) and a mouse study on mRNA immunotherapy (PMID 41407851). No large randomised trials or meta-analyses are available in the supplied sources.
Can fasting reverse your biological age?
Fasting improves multiple ageing-related markers, but whether epigenetic clocks actually decline and what that means in practice has not yet been established. If you want to benefit from the health advantages of fasting, alternate-day fasting is, based on current studies, the best-supported choice for healthy adults.
How can I measure my biological age?
Epigenetic clocks, in particular GrimAge and PhenoAge, currently offer the best estimate of your biological age, but they are not yet ready for straightforward home use and require expert interpretation.
How quickly can you change your biological age with exercise?
Regular moderate to vigorous exercise is associated with a biological age that comes out 1 to 3 years lower, and molecular changes in muscles are measurable after just a few weeks. Whether a lower score on an epigenetic clock truly means living healthier or longer has not yet been proven: treat it as an encouraging signal, not a guarantee.
How large can the difference between my chronological age and my biological age be?
The typical spread between your biological and calendar age is around one to two years. Studies mention no hard upper limit, but biological age does predict health risks better than your year of birth.
Does your biological age change differently at night than during the day?
The night is biologically not a pause but an active recovery phase, and that phase deteriorates noticeably with age. Those who protect their sleep rhythm, with fixed times, limited screen use before bedtime and a longer nightly eating break, preserve that recovery function for longer.
Does calcium-AKG lower your biological age?
Reliable evidence that calcium-AKG lowers biological age in humans is still lacking. The widely cited claim of 8 years younger comes from a small study without a placebo group, conducted by researchers with a stake in the outcome. Wait for the results of the ongoing placebo-controlled study before drawing any conclusions from this.