Using the United Nations' Madrid indicators to better understand our ageing population.

Mean is the result of adding all the values in a set and dividing by the number of values in that set.

Median is the mid-point in a set of values half the set are above the number and half the set are below the number.

Older (men, women, people, or population) means aged 65 years or older (65-plus), unless otherwise stated.

Younger adults means people aged between 15 and 64 years, unless otherwise stated.

Younger people means people aged up to 64 years, unless otherwise stated.