A popular longevity message compares aging to a staircase, with sharper drops near ages 44, 60, and 78 instead of one smooth decline.
Science does support the idea that some biological changes cluster in waves. But the exact three-age schedule is not established, and one influential paper behind the claim received an editor’s note on July 15, 2026, saying part of its peak analysis is under review.
The practical takeaway is simpler because people age differently, and daily habits matter long before any milestone birthday.
Where the ages came from
Physician and healthy-longevity specialist Carmen Romero described aging as a staircase during an appearance on Cadena SER. “We do not age linearly,” she said, pointing to 44, 60, and 78 as moments when decline may feel steeper.
It is a memorable picture, but those numbers combine findings from different research projects.
The first major source was a 2019 analysis led by Benoit Lehallier and Tony Wyss-Coray at Stanford University. Researchers measured 2,925 proteins in blood plasma from 4,263 people ages 18 to 95 and found group-level waves near 34, 60, and 78.
Proteins are working molecules that help cells communicate, repair damage, and run everyday body processes.
What happened to age 34
A separate 2024 multi-omics study led by Xiaotao Shen and Michael Snyder followed 108 adults ages 25 to 75. Multi-omics means the team examined many layers of biology at once, including proteins, fats, metabolic chemicals, immune signals, and microbes.
The authors reported clusters near 44 and 60, involving lipid and alcohol metabolism around the first crest and immune, carbohydrate, and kidney-related changes around the second.
That is how 34 appears to have been replaced by 44 in many retellings, while 78 was retained from the older study. Yet the 2024 project could not test a wave at 78 because no participant was older than 75. The ages 44, 60, and 78 are not three steps confirmed by one dataset.
The newest warning
There is another reason for caution. On July 15, 2026, Nature Aging added an editor’s note saying the reliability of some analyses used to detect peaks at certain ages is in question. The authors and editors are assessing the issue and whether corrections are needed.
That notice does not prove the broader idea of nonlinear aging is wrong. The 2019 blood-protein work and other research still suggest that biological changes can bunch together rather than arrive at a perfectly even pace.
But experts cannot yet hand everyone a calendar that predicts when the body will take a sudden step down.
Biological age is personal
Chronological age is simple. It is the number of years since birth. Biological age estimates how much wear, damage, and loss of function has accumulated in cells, tissues, and organs, which is why two 60-year-olds can have very different strength, blood pressure, or recovery.
A 2023 organ-aging study illustrates the point. It analyzed 5,676 adults and found different aging patterns among organs, with nearly one in five people showing accelerated aging in one organ. There may be no single master clock ticking at one speed from head to toe.
What the studies did not prove
The phrase “metabolic strike” makes age 44 sound like a diagnosis, but the 2024 paper described a statistical crest in molecular changes. Its cohort was small, and participants were tracked for a median of about 20 months. It did not show that everyone suddenly loses muscle or gains body fat on their 44th birthday.
Likewise, the 2019 study did not show that turning 78 causes dependence. It found a crest in the number of changing blood proteins across groups, not an abrupt loss of independence in each person. A birthday is not a trapdoor.
What protects healthspan
Healthspan means the years lived with good function, not simply the total years alive. For adults 65 and older, current physical activity guidance calls for at least 150 minutes of moderate aerobic movement each week, muscle-strengthening work on two days, and balance activity.
A brisk walk, stairs, or chair stands can make the advice feel less like a gym assignment and more like daily life.
Sleep and food matter too. Older adults generally need seven to nine hours of sleep, while nutrient-dense meals with enough protein can help support muscle and overall health. These habits are not an antidote to aging, but consistency can lower health risks and help preserve the ability to handle ordinary tasks.
Relationships also belong in the health conversation. A World Health Organization report links strong social connection with better health, while loneliness is associated with heart disease, stroke, diabetes, cognitive decline, and earlier death.
Calling a friend or joining a local group may sound small, but those routines can matter.
The real lesson of the staircase
The staircase metaphor works best as a reminder to prepare, not a countdown. Regular movement, sleep, balanced meals, preventive care, and social contact will not freeze biological time, but they can make later steps easier to manage.
Starting earlier gives healthy habits more time to work, yet beginning at 60 or 78 still has value.
The main 2019 study was published in Nature Medicine.
