Aging is an inevitable part of the human life cycle, but it has long been considered a slow and gradual process. However, recent scientific research has revealed that aging accelerates significantly at specific ages, particularly in the later middle and early old ages. These findings challenge traditional notions of aging and offer new perspectives on our understanding of it.

Aging's Tipping Points: 44 and 60

A research team from Stanford University and Nanyang Technological University in Singapore conducted a long-term study, the results of which were published in the journal Nature Aging.

This study conducted long-term tracking of 108 subjects aged 25 to 75, analyzing changes in various biomolecules in their bodies, including RNA, proteins, lipids, gut, skin, nasal, and oral microbiomes, totaling 135,239 biological characteristics. The results showed that aging does not occur uniformly but accelerates significantly at two key points: 44 and 60 years of age.

Specifically, at ages 44 and 60, the levels of many molecules in the human body changed significantly. Of all the molecules studied, approximately 81% showed changes at age 44 or 60. These changes peaked in the mid-40s and again in the early 60s.

Clustering Reveals Nonlinear Changes in Multi-omics Analysis During Human Aging

In addition to the above changes, scientists also found that aging is not a slow process but has mutation points when studying intestinal DNA methylation levels. DNA methylation is like labeling each gene to distinguish them, which helps cells identify the function of each gene. However, as we age, methylation labels in certain areas gradually increase, while those in other areas may decrease. Because of this close relationship between DNA methylation and the aging process, scientists have been able to use these methylation labels to develop various biological clocks for measuring aging.

However, not all methylation sites follow this rigid pattern. Researchers found that in other methylation sites, some showed highly ordered nonlinear changes. The nonlinear changes in these methylation sites suggest that multiple aging manifestations, including stem cell depletion and neuronal degeneration, may not be a gradual process.

In summary, aging is not simply the passage of time but involves complex molecular mechanisms and environmental factors. Scientists' research has revealed that aging accelerates significantly at specific ages (such as 44 and 60), and these findings provide new perspectives on our understanding of aging and new strategies for preventing age-related diseases.

References:

[1] Shen X , Wang C , Zhou X ,et al.Nonlinear dynamics of multi-omics profiles during human aging[J].Nature Aging[2025-01-23].DOI:10.1038/s43587-024-00692-2.

[2] Olecka M , Van Bmmel A , Best L ,et al.Nonlinear DNA methylation trajectories in aging male mice[J].Nature Communications, 2024, 15(1).DOI:10.1038/s41467-024-47316-2.