Many people believe the body ages gradually and consistently. However, recent biological analyses indicate that aging is not a slow, steady decline but rather accelerates in distinct phases, as if the body "climbs steps" instead of aging uniformly each year.
Scientists at Stanford University, California, US, analyzed biological samples from 108 individuals aged 25 to 75. They discovered significant molecular changes associated with aging become apparent after 40 and 60 years of age. Doctor Michael Snyder, a genetics expert at Stanford University, states that longevity does not always correlate with an equally long healthy lifespan. He notes that many individuals live long, but their period of true health is often 11-15 years shorter than their overall lifespan.
Phase one: age 44 – significant changes emerge
In the early to mid-40s, the body begins to undergo a series of changes related to metabolism and tissue structure. Some of these transformations are most notably observed around the 44-year mark.
Metabolic changes: The body's ability to process fats and substances like caffeine and alcohol tends to decline. This makes it easier for the body to accumulate fat, even if dietary habits remain largely unchanged.
Decline in connective tissue and muscle: Collagen gradually decreases, leading to less elastic skin and connective tissue. Simultaneously, muscle mass also slightly reduces without consistent exercise.
Hormonal fluctuations: Certain hormones begin to fluctuate more, affecting sleep, energy levels, and recovery from stress.
Increased low-grade inflammation: The body tends to experience prolonged low-level inflammation, linked to fatigue and slower recovery rates.
The research team suggests these changes not only reflect age but are also connected to lifestyle habits maintained for many years prior, including diet, sleep, physical activity levels, and alcohol consumption.
Phase two: age 60 – the second major leap in aging
While the initial phase involves gradual changes, around age 60 is marked as a time when many organ systems enter a period of more significant transformation.
More pronounced immune decline: The immune response capability decreases, making the body more susceptible to infections and slower to recover.
Impact on kidneys and metabolism: Kidney filtration function and glucose regulation capability tend to decline more noticeably.
Increased risk of chronic diseases: Conditions such as cardiovascular disease, diabetes, and metabolic disorders tend to emerge more frequently during this period.
Lifestyle influences the rate of aging
Experts acknowledge that aging is inevitable, but its effects can be slowed by maintaining healthy lifestyle habits.
Middle age is a critical period for brain health. Managing blood pressure, engaging in physical activity, and maintaining social and intellectual engagement between ages 40-60 can reduce the risk of dementia in later life. Individuals who maintain a healthy weight, eat well, exercise regularly, and avoid smoking in middle age often experience better health as they age.
Health status at ages 60, 70, or 80 is significantly influenced by lifestyle and habits maintained in previous years. Doctor Snyder encourages everyone to drink enough water to support kidney function, engage in strength training to maintain muscle mass, and manage cholesterol if LDL levels are high.
Bao Bao (According to Verywell Health)
