Figure 3. Centenarians age slow and develop diseases late, but do not receive medical care when diseases develop.

(A) Aging and biological age are log of chronological age because mortality increases exponentially. Centenarians age slower and their biological age is less than chronological age. The availability of medical care decreases with chronological age and centenarians receive less care because morbidity develops at a higher chronological age. So, morbidity span is not medically expanded in centenarians, creating the illusion of compression, relatively to everyone else. It is a relative compression. Green lines: healthspan. Red lines: morbidity span. Note: morbidity starts at the same biological age for both groups. (B) Reverse relationship between chronological age and health care.