Lifespan

Definition

Lifespan is the total length of time an organism lives, from birth to death, and can refer to an individual or a species-typical range used in ageing research and demography. [1] [3]

Why It Matters in Ageing Research

Lifespan is one of the most obvious outcomes in ageing research because it measures total survival. But it does not say whether those extra years are healthy or impaired, which is why researchers also use healthspan and functional outcomes. [2] [3]

Common Confusion

  • Lifespan is not the same as healthspan.
  • Lifespan is not identical to life expectancy, which refers to average expected survival in a population.
  • Longer lifespan does not automatically mean better late-life function or quality of life.

Related Reading

References

  1. Baylor OpenBooks. Lifespan, life expectancy, and healthy aging. https://openbooks.library.baylor.edu/lifespanhumandevelopment/chapter/22-1-lifespan-life-expectancy-healthy-aging/
  2. ScienceDirect Topics. Lifespan. https://www.sciencedirect.com/topics/medicine-and-dentistry/lifespan
  3. Austad, S. N., & Fischer, K. E. (2011). Aging and longevity. Journal of Nutrition in Gerontology and Geriatrics. https://pmc.ncbi.nlm.nih.gov/articles/PMC3257745/
Note

This glossary entry is provided for educational purposes only and does not constitute medical advice.