Politis

At What Age Is Someone Considered Elderly, According to Science?

Published January 10, 2026, 14:10
At What Age Is Someone Considered Elderly, According to Science?

New research identifies three key phases of change in the human body that mark aging: at 34, 60, and 78 years old. The study, which analyzed protein levels in 4,263 individuals, found that 1,379 proteins change with age, with significant changes occurring at these specific ages. This suggests that aging is not a linear process, but evolves in distinct phases. At 34, the body appears to 'shift gears,' marking the end of biological youth. The period from 34 to 60 years is considered adulthood, while from 60 to 78 years we speak of 'late maturity.' After 78 years, the body enters the final stage of aging. The physical changes associated with aging include reduced DNA repair capacity, slowed metabolism, loss of muscle mass, weakened bones, sleep disturbances, decreased hearing and vision, and difficulty recalling information. All of these are linked to reduced protein production and changes in the body's molecular environment. The research highlights that plasma proteins can be used as biomarkers for assessing overall health and biological age.