Is it true that women age more slowly biologically than men?
Multiple studies confirm that women are biologically younger than men of the same age, but women also spend their extra years more often in poorer health. The difference is therefore real, but more complex than the simple conclusion that 'women age more slowly'.
Women have a lower biological age on average than men, as seen across multiple molecular measures. A large systematic review of 156 publications found that male sex is significantly associated with acceleration on multiple epigenetic clocks. An Australian study of 560 participants confirmed that women show considerably less epigenetic ageing acceleration than men. At the same time, the size of the effect varies depending on the type of measurement used.
That women live longer can be observed all over the world and in every historical period for which reliable data exist. Women are also overrepresented among centenarians. How large the difference is precisely varies by country and era.
Yet 'ageing more slowly' is not the whole story. Towards the end of life, women are on average frailer and in poorer health than men. An Italian study of 452 participants showed that women are less vulnerable up to the age of eighty, but above the age of one hundred they are actually more vulnerable than men. Men also perform better on physical function tests at advanced ages. This is sometimes called the 'sex-morbidity paradox': longer-lived and biologically younger, yet more fragile.
Why women age biologically more slowly is not yet well understood. Possible explanations include having two X chromosomes, mitochondrial DNA inherited through the mother, differences in gut microbiota, and hormonal factors. Researchers describe the underlying biology itself as 'complex and still poorly understood'. Moreover, sex differences have far from always been studied systematically, meaning that for most mechanisms the available data are insufficient.
Based on a systematic review (156 publications, >1,300 study results), an Australian cohort study (n=560), an Italian study (n=452), and two broader review articles on sex differences in ageing and longevity.
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.
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 loneliness accelerate your biological age?
Whether loneliness accelerates your biological age at the cellular level cannot be determined from the available studies. Research does show, however, that prolonged loneliness leads to measurable physical decline, more disease, and a higher risk of premature death: reason enough to take social contact seriously.
Which blood values tell you something about how quickly you are biologically ageing?
Blood values such as protein profiles, DNA methylation patterns, telomere length and common inflammatory markers each provide an indication, in their own way, of how quickly you are biologically ageing. The specialised tests are not yet standard general practice care, but your routine blood work already contains useful clues.
Does everyone age at the same rate, or do people truly age at different speeds?
At the molecular level everyone ages at a broadly similar baseline rate, but in terms of health and life expectancy people diverge by decades, driven largely by income, lifestyle and genetics.
Does your body age faster after a prolonged period of stress?
Prolonged stress demonstrably accelerates biological ageing through multiple measurable mechanisms. Reducing stress, maintaining a healthy lifestyle, and addressing socioeconomic circumstances are the most concrete strategies the research offers.