NIJAMSS peer-reviewed article

The Other Clock: Psychological Healthspan in the Age of Longevity: An Integrative Review and Conceptual Framework

Moumita Nandy; Arpit; S. Sandhya; Col. Jyotirmaya Satpathy; Sweta Adatia

Abstract: Contemporary longevity science has increasingly shifted from the extension of lifespan toward the extension of healthspan, broadly understood as the period of life characterized by relatively preserved health and functional capacity. However, despite substantial advances in geroscience, preventive medicine, and biological models of aging, the temporal dimension of psychological functioning remains insufficiently conceptualized. A longer lifespan or biological healthspan does not necessarily imply a longer period of emotional vitality, adaptive capacity, meaningful engagement, social connection, or psychological sustainability. Individuals may remain biologically functional while experiencing prolonged psychological depletion, loneliness, burnout, loss of purpose, or diminished agency. This integrative review and conceptual synthesis introduces the construct of psychological healthspan, defined as the duration across the life course during which an individual retains sufficient psychological capacity for adaptive functioning, emotional regulation, cognitive flexibility, meaningful social engagement, purposeful living, and agency, while maintaining the capacity to recover and reorganize following adversity and change. Literature from gerontology, psychology, psychiatry, resilience science, autonomic physiology, public health, and longevity research was conceptually synthesized to identify the theoretical foundations and boundaries of the construct. Six proposed domains of psychological healthspan are identified: emotional regulatory capacity; adaptive resilience and recoverability; cognitive and psychological flexibility; relational connectedness and social engagement; meaningful and purposeful engagement; and agency and self-directed functioning. The article introduces three related conceptual models: the Two-Clock Model, which conceptualizes biological and psychological aging as interacting but potentially divergent trajectories; the Psychological Healthspan Trajectory, which emphasizes recovery and cumulative depletion across the life course; and the Psychological Healthspan Gap, referring to the conceptual discrepancy between years of biological survival and years of psychologically sustainable engagement with life. We further propose that the two clocks are coupled through the autonomic nervous system: the chronically sympathetic state described here as the Red Mind and the parasympathetically anchored, restorative state described as the Blue Mind offer a measurable physiological interface, indexed by heart rate variability, through which psychological healthspan may be monitored and modified. Psychological health span is distinguished from psychological well-being, resilience, flourishing, successful aging, and mental health by its explicit temporal and longitudinal orientation. The paper argues that longevity science must move beyond asking how long the human body can remain alive and healthy toward understanding how long the human being can remain psychologically capable of living. Psychological healthspan is proposed as a framework for future measurement development, longitudinal research, preventive mental healthcare, longevity medicine, and public policy.

Keywords: Autonomic Nervous System; Blue Mind; Healthspan; Healthy Aging; Heart Rate Variability; Human Sustainability; Life Course; Longevity; Psychological Aging; Psychological Healthspan; Resilience

Journal

Nexus International Journal of Applied Science, Medicine and Social Sciences

e-ISSN

3144-2196

Publication date

August 2026

Volume / Issue

Vol. 1, Issue 2

Paper number

018

Article type

Integrative Review

Published paper ID

NIJAMSS-V1S2-AUG2026-018

Publisher

Nexus Academic Press

Access

Open Access

Full text PDF: https://www.nijamss.org/archives-download/nijamss-vol-1-series-2-august-2026-paper-018.pdf