Longevity influencer Bryan Johnson has claimed that flying from the United States to Australia increased his biological age by the equivalent of about 13 years. The claim is reported across outlets including the Brisbane Times, Sydney Morning Herald and The Age, which also question whether the effect is real or how it should be interpreted.
The articles note that biological age is typically estimated using biomarkers rather than years added in a direct, measurable way. They also discuss possible mechanisms that could affect the body during long-haul travel, such as jet lag, disrupted sleep, stress, changes in routine and potential impacts on circadian rhythms. However, the sources also present expert caution, indicating that there is no established, widely accepted evidence that an overseas flight automatically “ages” a person by a specific number of years.
Overall, the reporting frames Johnson’s statement as a personal measurement and interpretation, while highlighting that scientific understanding of travel-related biological changes does not support a simple, universal conversion of flight experience into a fixed increase in biological age.
