Between 1950 and 2011, the world's urban population increased fivefold. In 2007, for the first time, the number of people living in cities surpassed the number of people living in the country. In 2019, the urban population had already reached 55% of the total population, and by 2050, it is estimated that just over two thirds of the population will live in urban areas. However, this growth is not constant in all parts of the world: according to the UN World Urbanization Prospects 2018 Report, the global urban population is expected to grow by 2.5 billion inhabitants between 2018 and 2050, with almost 90% of this increase concentrated in Asia and Africa. As populations in these areas increase, so will the demand for energy, food, and water, making resources more scarce. This scarcity will be compounded by the negative impact of urbanization on the climate and the environment.

Architecture is constantly changing and adapting to new needs, which are linked to social, economic, technological, political, and demographic changes. In this sense, the aging population is one of the most outstanding changes of the 21st century: The increase in life expectancy and the decrease in fertility rates mean that the older population is increasingly numerous. How can architecture help to provide a better quality of life, promote the autonomy, dignity, and well-being of the elderly?

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