New research suggests that people who live to 100 years old possess a 'superhuman' ability to circumvent major illnesses. Two comprehensive studies of older adults in Sweden reveal that centenarians tend to develop fewer diseases, accumulate them at a slower pace, and often entirely avoid the most fatal age-related conditions, despite their extended lifespans. This work, conducted by an international research team, posits that exceptional longevity is intrinsically linked to a distinct pattern of aging where illness is either delayed significantly or altogether prevented. These findings challenge the prevalent notion that a longer life inevitably entails more years of compromised health.

The first study analyzed health records of 170,787 individuals born in Stockholm County between 1912 and 1922. Participants were monitored for up to 40 years, from age 60 until their death or until they reached 100. The analysis demonstrated that centenarians not only exhibited lower disease rates in late-midlife but maintained this health advantage throughout their lives. For instance, at 85 years old, only four percent of those who lived to 100 had experienced a stroke, compared to approximately 10 percent among those who died between 90 and 99. Similarly, by the age of 100, merely 12.5 percent of centenarians had suffered a heart attack, contrasted with over 24 percent of those who died in their 80s. Researchers interpret this to mean centenarians are not merely surviving serious illnesses better, but are avoiding them for much longer, or entirely.

To further investigate whether longevity is also tied to avoiding less severe conditions, a second, larger study was conducted. This analysis encompassed 40 different medical problems, ranging from mild to severe, including hypertension, heart failure, diabetes, and heart attacks. Researchers tracked 274,108 individuals born between 1920 and 1922 for roughly 30 years, either from age 70 until death or until they reached 100. Only 4,330 participants, or 1.5 percent, achieved centenarian status. Even with this broader scope of conditions, the results remained consistent: centenarians developed fewer diseases overall, and their rate of disease accumulation was slower throughout their lifetime. Cardiovascular disease, though the most common diagnosis across all age groups, was significantly less prevalent among centenarians; at age 80, only eight percent had been diagnosed with it, compared to over 15 percent of those who died at 85. Their lower rates of cardiovascular illness appear central to their extended survival. Centenarians also displayed greater resilience to neuropsychiatric conditions such as depression and dementia across their lives.

While most centenarians eventually developed multiple health conditions, this typically occurred much later in life, usually around the age of 89. Crucially, this progression lacked the sharp health decline observed in non-centenarians during their final years. In contrast, non-centenarians generally experienced a steep increase in health problems in the last years of their lives. This pattern was notably absent in those who reached 100, whose health decline was more gradual and slower, even into their 90s.

Professor Karin Modig, a leading epidemiologist at the Karolinska Institutet, highlighted these findings, stating that her research team discovered centenarians seem to possess a