In 1991, the General Assembly adopted the United Nations Principles for Older Persons (resolution 46/91). In 2002, the Second World Assembly on Ageing adopted the Madrid International Plan of Action on Ageing, to respond to the opportunities and challenges of population ageing in the 21st century and to promote the development of a society for all ages.

The composition of the world population has changed dramatically in recent decades. Between 1950 and 2010, life expectancy worldwide rose from 46 to 68 years. Globally, there were 703 million persons aged 65 or over in 2019. The region of Eastern and South-Eastern Asia was home to the largest number of older persons (261 million), followed by Europe and Northern America (over 200 million).

Over the next three decades, the number of older persons worldwide is projected to more than double, reaching more than 1.5 billion persons in 2050. All regions will see an increase in the size of the older population between 2019 and 2050. The largest increase (312 million) is projected to occur in Eastern and South-Eastern Asia, growing from 261 million in 2019 to 573 million in 2050.