Global life expectancy reached 73.3 years in 2023, almost back to the 73.4 years recorded in 2019 before the pandemic, according to the World Health Organization’s Global Health Estimates for 2000 to 2023.
The same data put healthy life expectancy, the years a person can expect to live in full health, at 62.8 years. The gap between the two numbers is a reminder that longer lives do not automatically mean healthier ones.
The estimates show how the causes of death have shifted. Noncommunicable diseases such as heart disease, cancer and diabetes now account for 74 percent of deaths worldwide, up from 58 percent in 2000. Ischaemic heart disease remains the single biggest killer, at about 9.5 million deaths.
One of the starkest trends is dementia, which rose from the 19th leading cause of death in 2000 to the 5th in 2023, with deaths tripling over the period. Meanwhile, COVID-19, which dominated mortality statistics earlier this decade, fell out of the top 10 causes by 2023.
Canada is not an exception to these patterns. Canadian health planners face the same arithmetic: an ageing population, rising dementia care needs, and chronic diseases that consume most health budgets. The WHO numbers help explain why provinces keep expanding community care, dementia strategies and prevention programmes even as hospitals stay under pressure.
Public health specialists caution that global averages hide sharp differences between countries, and even between regions of the same country. But the direction of travel is consistent almost everywhere: infectious diseases, while still dangerous, are giving ground to the long, slow conditions of longer lives.
The challenge the data pose is simple to state and hard to solve: health systems built for acute illness now have to finance decades of chronic care.
