People over forty feel 20% younger than their age: subjective age across the lifespan.
Level 4 - case-series / case-control
Cross-sectional survey study (graded by design analogy, non-clinical)
PubMed 17328372 · doi:10.3758/bf03193996
What was done
Subjective age (the age individuals perceive themselves to be) was assessed via in-person, in-home interviews in a representative Danish sample of 1,470 adults aged 20 to 97 years. The study analyzed proportional discrepancies between subjective and chronological age across age groups and evaluated the contribution of demographic variables (gender, income, education).
What was found
Adults younger than 25 reported older subjective ages, whereas those older than 25 reported younger subjective ages. When evaluated as a proportion of chronological age, the discrepancy showed no increase after age 40, with older respondents consistently feeling 20% younger than their actual age. Demographic variables (gender, income, and education) accounted for very little variance in subjective age.
Why it matters
These findings suggest that subjective age across the lifespan aligns with a developmental pattern rather than simple age-denial. The observation of a consistent 20% proportional reduction in felt age after age 40 provides a clear quantitative baseline for life-course psychological research.
Limits
The study is cross-sectional, precluding longitudinal causal tracking of subjective age changes over time. Findings from a Danish sample may not generalize across different cultures or socioeconomic settings, and the abstract omits exact statistical effect sizes and variance values for demographic predictors.
Cited by
- supports After the age of 40, most people report feeling about 20% younger than their chronological age.