![]() Life expectancy changes over the course of a person’s life because as they survive the periods of birth, childhood and adolescence, their chance of reaching older age increases. ![]() In Australia, a boy born in 2019–2021 can expect to live to the age of 81.3 years and a girl would be expected to live to 85.4 years compared to 51.1 for boys and 54.8 years for girls born in in 1891–1900. Figure 8.1: Life expectancy (years) at birth in Australia, by sex, 1891–1900 to 2019–2021 ![]() Compared with their counterparts in 1891–1900, boys and girls born in 2019–2021 can expect to live around 30 years longer (Figure 8.1). Life expectancy in Australia has improved dramatically for both sexes in the last century, particularly life expectancy at birth. In summarising mortality patterns, life expectancy is often expressed as the number of years of life, from birth, a person is expected to live. Life expectancy measures how long, on average, a person is expected to live based on current age and sex-specific death rates. Life expectancy is the most commonly used measure to describe population health and reflects the overall mortality level of a population.
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