Longevity influencer Bryan Johnson said a long-haul flight from the U.S. to Australia added 13 years [1] to his biological age.
The claim highlights the growing tension between personalized health tracking and established medical science regarding how the body reacts to extreme travel stress.
Johnson, the founder of Kernel, traveled from Los Angeles to Sydney shortly before the reports surfaced on June 12, 2024 [1]. He said the sudden increase in his biological age was due to the physiological stress of long-duration air travel, jet lag, and circadian disruption [1].
Biological age differs from chronological age, as it attempts to measure the functional state of a person's cells and organs. Johnson frequently monitors his health data to optimize his longevity protocols, a process that involves rigorous dieting and supplement regimes.
While long-haul flights are known to cause temporary inflammation and sleep disturbances, experts said the claim that a single trip could advance biological age by 13 years [1] is not supported by current science. The extreme nature of the figure suggests a volatility in the specific biomarkers Johnson uses to track his aging process.
Travel between the U.S. and Australia is among the longest commercial routes in the world. The combination of altitude, recycled air, and severe time zone shifts often leads to significant disruptions in the human biological clock. However, most medical professionals said these effects are transient rather than permanent shifts in cellular age [1].
“A long-haul flight from the U.S. to Australia added 13 years to his biological age.”
This incident underscores the limitations of current biological age clocks. While these tools provide a snapshot of health, they can be highly sensitive to short-term stressors, potentially leading to dramatic fluctuations that do not reflect a permanent increase in aging or a decrease in life expectancy.
