Subjective Life Expectancy and Decision-Making Behavior

Subjective life expectancy (SLE) denotes an individual’s personal estimate of their remaining lifespan and reflects a complex interplay between empirical knowledge, psychological disposition and environmental cues. It is informed by bottom-up factors such as demographic characteristics, health status and family history, alongside top-down influences including optimism bias, cognitive heuristics and locus of control. Variations in SLE have been shown to shape decisions across multiple domains, from retirement planning and pension contributions to engagement in preventive health behaviours and chronic disease management. When subjective and actuarial lifespans diverge, individuals may underinvest or overinvest in long-term health and financial security. Cognitive distortions—such as nonlinear probability weighting—can lead to systematic overestimation or underestimation of survival chances, thereby affecting risk perception and subsequent choices. Grasping how people form and act upon their survival expectations holds global importance for designing effective public health campaigns, financial-planning interventions and policies that support healthy ageing and sustainable economic behaviour.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Research from all publishers

Recent cross-sectional research in Denmark involving adults aged 50–70 has revealed that a substantial proportion of participants markedly overestimate their chance of reaching age 85. Those with higher health literacy, a strong internal health locus of control and greater willingness to take health risks reported optimism exceeding actuarial estimates. Conversely, daily medication users, smokers and heavy drinkers tended to underestimate their survival prospects. This misalignment suggests avenues for tailored behavioural interventions that align subjective expectations with statistical reality.

A longitudinal study of middle-aged and older hypertensive patients in China employed cross-lagged panel modelling to examine reciprocal links between self-perceived disease control and self-management behaviours (medication adherence, self-monitoring and physical activity). Subjective life expectancy partially mediated these relationships, accounting for up to 37% of the effect of perceived control on subsequent health behaviours. Findings underscore the importance of reinforcing both present disease control and future lifespan perspectives to promote sustained self-care.

An analysis of age-dependent survival beliefs has highlighted the growing role of cognitive decline in shaping subjective survival estimates. Using probability weighting functions to model deviations from objective mortality probabilities, researchers demonstrated that cognitive weakening, rather than optimism bias per se, increasingly drives overestimation of survival in older adults. Such insights illuminate how mental capacity influences risk assessment and long-term decision making.

Subjective Life Expectancy and Decision-Making Behavior publication trend

The graph below shows the total number of articles in subjective life expectancy and decision-making behavior across all publications each year (not limited to Nature Index journals).

Technical terms

Subjective life expectancy (SLE): An individual’s personal estimate of the probability of surviving to a given age, reflecting both information and psychological factors.

Health locus of control: A psychological construct denoting the degree to which individuals believe health outcomes are under their own control (internal) versus determined by external forces.

Probability weighting function: A cognitive heuristic describing how people distort true probabilities when forming beliefs about uncertain events, often overweighting small probabilities and underweighting large ones.

Self-management behaviours: Actions undertaken by individuals to manage chronic conditions or maintain health, such as medication adherence, monitoring vital signs and engaging in regular physical activity.

References

1. Subjective expectation of reaching age 85: agreement with population statistics and association with behavioral and psychological factors. BMC Geriatrics (2023).
2. COGNITION, OPTIMISM, AND THE FORMATION OF AGE‐DEPENDENT SURVIVAL BELIEFS. International Economic Review (2020).
3. Interaction between self-perceived disease control and self-management behaviours among Chinese middle-aged and older hypertensive patients: the role of subjective life expectancy. BMC Public Health (2022).