Comparar métodos

	Characteristics Approach to Population Aging	Healthy Life Expectancy
Área	Social Gerontology	Demografia
Família	Survival analysis	Survival analysis
Ano de origem	2013	1971
Autor original	Warren C. Sanderson and Sergei Scherbov	Daniel F. Sullivan (Sullivan method); developed by the WHO/REVES tradition
Tipo	Framework for measuring population aging by characteristics rather than chronological age	Health-expectancy estimator partitioning life expectancy into healthy and unhealthy years
Fonte seminal	Sanderson, W. C., & Scherbov, S. (2013). The characteristics approach to the measurement of population aging. Population and Development Review, 39(4), 673-685.	Sullivan, D. F. (1971). A single index of mortality and morbidity. HSMHA Health Reports, 86(4), 347–354.
Outros nomes	Characteristics-Based Aging Measures, Sanderson-Scherbov Characteristics Approach, Alpha-Age Approach, Equivalent-Age Method	HALE, Health-Adjusted Life Expectancy, Disability-Free Life Expectancy
Relacionados	3	4
Resumo	The characteristics approach reconceptualizes what it means to be 'old' by measuring age through people's characteristics rather than the number of years since birth. Developed by Warren Sanderson and Sergei Scherbov and set out comprehensively in their 2013 Population and Development Review article, it responds to the fact that conventional aging measures treat a fixed chronological age, such as 65, as a permanent marker of old age even though people at 65 today are healthier and longer-lived than their counterparts decades ago. The core idea is that many relevant attributes, such as remaining life expectancy, health, cognitive function, and disability, vary with both age and time, so old age should be defined by reaching a given level of such a characteristic rather than a fixed birthday. The approach computes equivalent or 'alpha' ages, the ages at which a characteristic takes a chosen reference value, and uses them to build characteristic-based aging indicators. Comparing these with conventional measures often shows that populations are aging more slowly, or even getting younger on some dimensions, than chronological measures suggest. The framework has reshaped how demographers assess the consequences of population aging.	Healthy life expectancy partitions ordinary life expectancy into the years a person can expect to live in good health and the years expected to be lived with disability or ill health. Building on the life table, the classic Sullivan method weights each age interval's person-years by the prevalence of good health, so the resulting expectancy answers not just 'how long will people live?' but 'how many of those years will be healthy?'. It has become a headline summary of population health, reported by the World Health Organization as HALE and tracked alongside life expectancy to judge whether longer lives are also healthier lives.