The population of state pensionable age is expected to rise by 32% over the next 25 years from 11.8m in 2008 to 15.6m in 2033.
- The number of people over 85 is projected to more than double over the next 25 years from 1.3 million in 2008 to 3.3 million by 2033.
- The number of centenarians - people who live to 100 - is expected to rise more than sevenfold from 11,000 in 2008 to 80,000 in 2033.
- The proportion of people aged 65 and over is projected to increase from 16% in 2008, to 23% by 2033.
The population of working age is projected to rise by just under 14%, from 38.1m in 2008 to 43.3m in 2033.
In 2008 there were 3.2 people of working age for every person of state pensionable age, but this ratio is expected to fall to 2.8 by 2033, taking into account the future changes to state pension age.