Explain the causes of population ageing, analyse the consequences of a rising dependency ratio, and evaluate strategies for managing an ageing population.

What this dot point is asking

This dot point develops Population Change by focusing on the structural challenge facing high-income countries. The key geographical skill is using the dependency ratio and population pyramids to explain and quantify the consequences of ageing.

Why populations age

Ageing is the combined result of two long-term trends. First, birth rates fall as countries develop, so fewer children enter the population. Second, life expectancy rises with better health care, nutrition and living standards, so people live longer. Together these reshape the population pyramid from a wide-based triangle into a top-heavy structure. The post-war baby-boom generation reaching retirement age has accelerated ageing in many Western countries.

Understanding the dependency ratio

The dependency ratio compares the dependent population (conventionally those under 15 and over 64) with the working-age population (15 to 64). A higher ratio means each worker supports more dependants.

It is useful to separate the youth dependency ratio (children) from the aged dependency ratio (older people), because they create different pressures: youth dependency demands schools and jobs, while aged dependency demands pensions and health care.

Consequences across the three systems

Economically, a shrinking workforce can slow growth and reduce the tax base just as health and pension costs rise, straining government budgets. Socially, demand grows for aged care, health services and age-friendly housing and transport, and informal care often falls on family members. There can also be a loss of experienced workers and intergenerational tension over the fairness of pension funding.

Japan is the clearest case: with one of the world's oldest populations and a shrinking workforce, it faces rural depopulation, labour shortages and very high health and pension demands. Australia is ageing more slowly, partly because migration adds working-age people, but still faces rising aged-care and health costs.

Evaluating management strategies

Countries respond in several ways, each with trade-offs.

• Raising the retirement or pension age keeps people working longer and eases pension costs, but is politically unpopular and harder for manual workers.
• Encouraging skilled migration adds working-age taxpayers, as in Australia, but depends on housing and services keeping pace and can face social resistance.
• Pro-natal policies, such as baby bonuses and parental leave, aim to lift birth rates, but in Japan and parts of Europe they have had limited success.
• Automation and lifting workforce participation, including for women and older workers, can offset a smaller workforce.
• Improving productivity and aged-care efficiency helps fund the costs of ageing without raising taxes sharply.

Linking it together

A complete response explains ageing as the result of falling fertility and rising life expectancy, analyses the consequences of a rising aged dependency ratio across the three systems, and evaluates management strategies using cases such as Japan, Europe and Australia. That structure matches the geographical skills and applications criteria the SACE Board assesses.