Related Experiment Video
Updated: May 16, 2026
10:00
Measurement of Lifespan in Drosophila melanogaster
Published on: January 7, 2013
Sex and life expectancy
Joshua E Seifarth1, Cheri L McGowan, Kevin J Milne
1Faculty of Human Kinetics, Department of Kinesiology, University of Windsor, Windsor, Ontario, Canada.
Gender Medicine
|November 21, 2012
Summary
Females live longer than males due to a complex interplay of biological factors, including genetic and physiological differences. Understanding these mechanisms is key to developing strategies for healthy aging in both sexes.
Area of Science:
- Biology
- Genetics
- Physiology
Background:
- A persistent sexual dimorphism in human life expectancy, with females living longer than males, is observed globally.
- This longevity gap is influenced by multifaceted sociological and biological factors.
Purpose of the Study:
- To review and highlight the biological mechanisms contributing to the sexual dimorphism in human life expectancy.
- To explore the biological underpinnings of the female advantage in longevity.
Main Methods:
- A comprehensive literature search was conducted using PubMed, ISI Web of Knowledge, and Google Scholar.
- Relevant English-language articles published up to August 2012 were identified, reviewed, and synthesized.
Main Results:
- Biological differences between sexes include genetic factors (e.g., X chromosome inactivation, mitochondrial inheritance) and physiological factors (e.g., hormonal responses, immune function, metabolism).
- These biological factors likely contribute, at least partially, to the observed female advantage in life expectancy.
- The relative importance of individual factors remains challenging to ascertain due to the complexity of human life.
Conclusions:
- Despite societal factors, a biological basis for the sex difference in life expectancy exists.
- Several biological mechanisms may explain why females tend to live longer than males.
- Further research into these mechanisms is crucial for developing effective healthy aging strategies for both sexes.
Related Concept Videos
01:22Applications of Life Tables
Life tables are versatile across various fields, providing a quantitative basis for analyzing mortality and survival rates. Whether used by demographers, actuaries, epidemiologists, or sociologists, life tables offer valuable insights into the dynamics of life and death, facilitating informed decisions in public health, insurance, conservation, and beyond. Their broad applicability highlights the interconnectedness of demographic data with practical outcomes in everyday life and strategic...
01:22Life Tables
A life table is a statistical tool that summarizes the mortality and survival patterns of a population, providing detailed insights into the likelihood of survival or death across different age intervals within a cohort. By organizing data on survival probabilities and mortality rates, life tables offer a clear snapshot of population dynamics over time. They are extensively used in demography, public health, actuarial science, and ecology to analyze life expectancy, design health interventions,...
01:43Sex Linked Disorders
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
01:29Life Histories
Overview
02:20Longitudinal Research
Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
01:28Menopause
Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...