Aging Overview - Concepedia

Principles

Definition

Aging is the complex, multi-scale biological process characterized by the progressive accumulation of damage, leading to functional decline and increased susceptibility to morbidity and mortality. As a field of academic inquiry, it investigates the molecular, cellular, physiological, and evolutionary mechanisms underlying this process, seeking to understand its causes, consequences, and potential therapeutic modulation.

Ontological type

Biological Hallmarks

Intervention Strategies

Molecular Mechanisms

Key developments

Key Figures

Biopsychosocial Integration era

Denham Harman [1] emerges as a central figure in aging research during the Biopsychosocial Integration era, with influential ties to University of California, Berkeley [2] and University of Nebraska–Lincoln [3]. Harman [1] introduced the aging theory based on free radicals in his 1956 paper Aging: A Theory Based on Free Radical and Radiation Chemistry [4], arguing that cumulative oxidative damage drives aging, a mechanistic insight that anchored cross-disciplinary inquiry linking chemistry and physiology. This era's multi-domain orientation can be traced to Harman [1]'s oxidative-stress framework, which encouraged integrating physiological and psychosocial dimensions. Harman [1]'s work also influenced measurement practices and policy discussions by promoting a biopsychosocial, integrative approach to aging.

Molecular Mechanisms and Measurement era

Denham Harman articulated the Free Radical Theory of Aging, emphasizing cumulative oxidative damage as a core molecular mechanism that shaped mechanistic research in this era. Elizabeth Blackburn and Carol Greider demonstrated telomerase and telomere dynamics in the 1990s, linking telomere attrition to cellular aging and senescence. Leonard Hayflick's work on cellular senescence and the Hayflick limit anchored the cellular basis of aging, tying molecular damage to limits on cell replication. On measurement, Linda Fried's 2001 frailty phenotype and related standardized functional assessments operationalized aging as a measurable phenotype, enabling epidemiology and clinical testing of interventions.

Translational Geroscience and Interventions era

Arthur F. Kramer [1] is associated with Johns Hopkins University [3] and the University of Washington [4] in this era. His key contributions include demonstrating that exercise training increases hippocampal size and improves memory, a finding published in the 2011 paper [7], which advanced the translational geroscience agenda by linking lifestyle factors to brain aging. Edward McAuley [2] is associated with Cornell University [5] and the University of Minnesota [6] during this era. He co-authored the same study showing exercise-induced neural and cognitive benefits, an contribution that helped anchor translational approaches to aging interventions within clinical and public-health frameworks [7].