New book argues aging is fluid, not fixed — introduces “flicker stage” where people can briefly reverse functional age
Authors Stuart Kaplan and Marcus Riley argue in Your Aging Advantage that aging is a fluid, seven-stage process—including a “flicker stage”—where intentional lifestyle and mindset shifts can briefly reverse aspects of functional, or “feels‑like,” age despite chronological years.
Key takeaways
- Flicker stage: The book names one of seven aging stages the flicker stage, where people experience brief shifts toward greater youthfulness in their functional or “feels-like” age.
- Functional vs. chronological: Kaplan and Riley distinguish functional age (performance/feelings) from chronological age and emphasize lifestyle, mindset, social ties and environment as triggers.
- Actionable model: Readers are encouraged to identify personal flicker triggers—physical, psychological, social or environmental—to intentionally “flicker back” to younger-feeling stages.
- Not a cellular claim: The book presents a psychosocial model; it does not offer peer-reviewed proof that whole-body biological aging is reversed by these flickers.
What the authors say: flickers, feels-like age and choice
Stuart Kaplan and Marcus Riley push back on the notion of an inevitable, unidirectional decline. They frame a lived or “feels-like” age that can diverge from the number on a birth certificate. Kaplan used a weather analogy: like a forecast that says 85 degrees but “feels like” 95 because of humidity, a person’s felt age can differ from chronological age.
Riley emphasizes that setbacks — illness, stress, loss — can make people feel older, but those changes are not necessarily permanent. He argues for an active process of “flickering back” to younger functional states via renewed social connection, exercise, environmental shifts and mindset changes.
For more on the authors’ public remarks, see the Fox News video interview with authors Stuart Kaplan and Marcus Riley about Your Aging Advantage.
How the flicker idea fits — and doesn’t — with current science
The book’s flicker stage is a psychosocial model: it emphasizes behavior, social context and mindset as drivers of temporary shifts in functional age. That approach differs from laboratory claims about reversing biological age at the cellular level.
Some scientific teams are exploring cellular rejuvenation and epigenetic reprogramming; these laboratory and biotech efforts are distinct from the book’s behavioral framing and are not yet widely available therapies. See Life Biosciences overview of longevity research and reporting on scientific discussions at global forums, such as the coverage of aging reversal discussions at the World Government Summit.
Objective measures: Some physiological systems show steady decline; for example, a study on visual flicker modulation thresholds found relative stability through midlife and more rapid change after about age 45—an example of sensory aging that follows predictable trajectories rather than momentary reversals. See the study on visual flicker modulation thresholds and aging.
Bottom line: The flicker stage is best read as an experiential and practical framework to help people feel and act younger at times, not as evidence of universal, system-wide biological rejuvenation.
A closer look at the seven-stage framing
Kaplan and Riley present aging as seven stages; the flicker stage has attracted the most attention for its hopeful message. Press coverage and interviews have focused on that stage, and public details on the full seven-stage model remain limited to the authors’ interviews and the book’s promotional material.
The stage model is intended as a vocabulary for readers and clinicians to notice feels-like age shifts and act—potentially complementing clinical measures rather than replacing biological testing or medical advice.
Credibility and limits — what to keep in mind
- Psychosocial framing: The flicker stage is a behavioral concept rooted in lifestyle, mindset and environment. It is supported mainly by the book and interviews, not by peer-reviewed claims of widespread biological age reversal.
- Distinct scientific work: Biotech research into cellular age-related markers is active but separate from flicker-stage claims; these domains should not be conflated.
- Physiological constraints: Some systems, such as sensory thresholds, show predictable declines; not all aspects of aging will respond equally or quickly to behavioral changes.
Implications for the world
Economic: If adopted broadly, the flicker-stage idea could expand markets for wellness, fitness, mental health and longevity services and prompt employers and insurers to design new programs supporting functional capacity.
Political: Arguing that age 65 is largely a social benchmark rather than a biological turning point may feed debates about retirement age and pension policy and encourage discussion of functional assessments versus fixed birth-year thresholds.
Social and cultural: Framing aging as flickering may reduce stigma and promote community resilience, though messaging should respect diverse cultural norms about aging and elder roles.
Practical applications for individuals
People can experiment with the flicker model at low risk by tracking their feels-like age and testing evidence-backed practices—exercise, sleep optimization, social connection, stress management and purposeful activity—that reliably improve well-being even if they do not equate to cellular rejuvenation.
Clinicians and public health programs might consider measuring functional age alongside clinical markers to better capture day-to-day vitality and capacity.
Sources and further reading
- Fox News video interview with authors Stuart Kaplan and Marcus Riley about Your Aging Advantage
- Study on visual flicker modulation thresholds and aging
- Life Biosciences overview of longevity research
- Coverage of scientific discussions on aging reversal at global forums
Reporting based on the Your Aging Advantage book and public interviews with its authors, plus independent scientific literature and industry coverage cited above.
