Study Shows the Exact Age When Aging Begins in the Human Body. Dr Nadeem Ghayas
February 7, 2026
The study conducted at different research institutions in China has given us a greater understanding of how and when the different parts of our bodies start to decline. Study shows that biological aging does not occur at a consistent rate throughout the human body. In fact, researchers have discovered that measurable molecular evidence of aging can be present in various tissues as early as the 30s, and that it accelerates significantly during midlife.
Chinese researchers conducted an extensive study on 516 tissue samples from 76 organ donors, who were aged 14 to 68, across multiple organs. The researchers used deep proteomic profiling to measure how protein expression changed with age in the different tissues. Since proteins represent actual biological functions such as inflammation, repair, metabolism, and degeneration they serve as excellent indicators of biological aging. The study was published in the journal Protein & Cell (Liu et al., 2025).
According to the researchers’ results, aging does not occur at a uniform pace throughout the entire body; instead, the aging process varies among the different organs, and some organs experience early vulnerabilities while others do not. A particularly vulnerable system identified in the study was the vascular system (the blood vessels), as vascular tissues exhibited early and significant age-related protein changes when compared with many other organs. As the blood vessel network provides essential connections and support to all organs, the early onset of aging in the vascular system could affect the aging of the entire body (Liu et al., 2025).
One protein that was highlighted in the study was GAS6 (growth arrest-specific protein 6). GAS6 plays roles in cell survival, cell proliferation, immune function, and cell migration. The researchers observed increases in GAS6 protein levels in aging vascular tissues. They reported experimental evidence suggesting that elevated GAS6 could play a direct role in contributing to the aging of the vascular system as opposed to being simply a marker of aging. Therefore, there is a potential for GAS6 and similar proteins to become targets for anti-aging treatments and/or treatments aimed at preventing disease (published in Protein & Cell) (Liu et al., 2025).
The researchers also found additional support for the concept of “staged” aging through previous plasma proteome research published in Nature Medicine, which found that aging occurs in stages, not as a steady linear process, throughout one’s lifetime (Lehallier et al., 2019). Previous longitudinal multi-omics research published in Nature Medicine also demonstrated that each individual develops his/her own unique “biological ageotype,” which means that an individual’s metabolic, immune, liver, or kidney systems will either age faster or slower than those of another individual, regardless of whether both individuals have the same chronological age (Ahadi et al., 2023).
Most recently, a large organ-aging proteomics study published in Nature showed that the biological ages of an individual’s organs can vary. Through the measurement of proteins derived from organs in the bloodstream, the researchers measured the biological age of specific organs and found that accelerated aging in a particular organ was predictive of increased risk of disease related to that organ (Wyss-Coray et al., 2024).
Collectively, these studies demonstrate that aging is:
1) Organ-specific,
2) Protein-driven, and
3) Staged, with early molecular shifts occurring in young adulthood and more pronounced acceleration occurring in middle-aged adults. Identifying where and when aging begins may help identify opportunities for the earlier detection of and more targeted prevention of age-related disease.
References
- Ahadi, S., Zhou, W., Schüssler-Fiorenza Rose, S. M., Sailani, M. R., Contrepois, K., Avina, M., … Snyder, M. P. (2023). Personal aging markers and ageotypes revealed by deep longitudinal profiling. Nature Medicine, 29, 760–769. Published in: Nature Medicine.
- Lehallier, B., Gate, D., Schaum, N., Nanasi, T., Lee, S. E., Yousef, H., … Wyss-Coray, T. (2019). Undulating changes in human plasma proteome profiles across the lifespan. Nature Medicine, 25, 1843–1850. Published in: Nature Medicine.
- Liu, G., et al. (2025). Proteomic landscape of human organ aging and systemic vascular influence. Protein & Cell. Advance online publication. Published in: Protein & Cell (Oxford University Press).