aging is a gradual decrease in function due to the accumulation of cellular damage. [1] more broadly, aging is the culmination of the physiological changes that occur over our lifespans. while some of these changes are seemingly harmless (like graying hair and wrinkles) others have a more profound impactaffecting aspects of health like mobility, bone strength, and disease susceptibility.  aging is a complex, non-linear process that is considered to begin in the fourth decade of life, between the ages of 30-39 years. [2] however, each person ages at a unique rate. some people maintain their mental capacity and stamina well into their later years, whereas others begin exhibiting signs of aging as early as their mid-20s. [3,4] while genetics and biology play a key role, the rate of aging is also significantly impacted by behavioral and psychological factors including diet, physical activity, smoking status, stress levels, sleep patterns, and social connections. [5-8]
United Kingdom