This map identifies the top 10 developed countries by share of over 65s (in 2028) and the top 10 by share of 20-39 year olds (also in 2028). It plots the top developed 100 cities by the same measure. Qatar, the UAE, Bahrain, Kuwait are set to be the most ‘youthful’ developed countries in 2028, along with Australia, Norway and New Zealand. ‘Youthful cities’ include Dubai, Melbourne, Shenzhen, and San Diego.

Conversely, by 2028, 30% of the population of Japan will be over 65. In nine major Japanese cities, the over 65 population will be greater than 30%. Hong Kong, Portugal, Germany, Italy and Spain all stand out as countries forecast to have high shares of over 65s in a decade’s time. Forecast ‘aged’ global cities include Tokyo, Lisbon and Pittsburgh