The average age of the UK population is rising. In 1971, it stood at 40.4. By 2020, it stood at 40.4. By 2037, it is expected to reach 42.8. There are fewer young people and more older people. The number aged 65 or over equalled the number of under-15s for the first time ever in 2014.
They show how older age groups are growing as a proportion of the population, while younger age groups are shrinking. The 'traditional age pyramid' is disappearing and being replaced by more or less equal-sized 'blocks' representing different age groups.
Older people consume a larger proportion of services such as health and social care than other age groups. This is particularly true of the 'old old' (usually defined as 75 and over) as against the 'young old' (65-74).
The number of pensioners living alone has increased and one-person pensioner households now account for about 15% or one in seven of all households. Most of these are female, both because women generally live longer than men, and because they are usually younger than their husbands.
The ratio of non-working people (young and old) to working-age people. As the number of retired people rises, this increases the dependency ratio and the burden on the working population.
It would be wrong to assume that 'old' necessarily equals 'economically dependent'. The age at which men and women can draw their state pension has been rising.
While an increase in the number of old people raises the dependency ratio, in an ageing population this is offset by a declining number of dependent children.
Much of the discourse around old age and ageing has been constructed as a problem - for example in terms of the cost of pensions or health care for the elderly.
From a Marxist perspective, the old are of no use to capitalism because they are no longer productive. As a result, the state is unwilling to support them adequately and so the family, especially female relatives, often has to take responsibility for their care.
In modern society, life is structured into a fixed series of stages, such as childhood, youth and so on. Age becomes important in role allocation, creating fixed life stages and age-related identities, such as worker or pensioner. The old are thus excluded from a role in the labour force and inside dependent and powerless.
The fixed, orderly stages of the life course have broken down. Trends such as children dressing in adult styles, later marriage and early retirement all begin to blur the boundaries between the life stages. This gives individuals a greater choice of lifestyle, whatever their age.
Unlike in modern society, consumption, not production, becomes the key to our identities. We can now define ourselves by what we consume. This means we can choose a lifestyle and identity regardless of age: our age no longer determines who we are or how we live.
As a result, the old become a market for a vast range of 'body maintenance' or 'rejuvenation' goods and services through which they can create their identities. These include cosmetic surgery, exercise equipment, gym membership, and anti-ageing products.
The emphasis on surface features means the body becomes a canvas on which we can write identities, and anti-ageing products enable the old to write different identities
The middle class have better occupational pensions and greater savings, while poorer old people have a shorter life expectancy and suffer more infirmity