Change 1: low birth rate and an ageing society
A low birth rate means few babies are born. When the average number of children per woman falls below about 2.1, each new generation is smaller than the one before.
At the same time people live longer, because of clean water, vaccines, medicines and good food.
Put the two together and older people become a bigger share of everybody. We call this an ageing society. In some countries one person in four or more is aged 65 or over.
- Causes: later marriage, high cost of raising children, long study, both parents working, and longer life.
- Effects: fewer workers, more cost for pensions and health care, empty classrooms, villages that shrink.
Change 2: the information society and AI
An information society is a society where information, not only goods, is the main thing people make, share and use. The internet, phones and computers carry it everywhere.
Artificial intelligence (AI) means computer programs that learn from lots of data and then do jobs that once needed human thinking, such as translating, recognising faces or finding disease in a scan.
- Good side: faster services, learning from anywhere, help for older people living alone.
- Risks: false news, loss of privacy, hacking, some jobs changing, people left behind who cannot use technology.
So we need information literacy: checking a source, protecting personal data and being kind online.
Change 3: globalisation
Globalisation means that countries are linked more and more through trade, money, travel, ideas and the internet.
Cheap shipping, flights and online communication made this possible. Today a car can have parts from ten countries, and a song can be heard worldwide in a day.
- Gains: more choice and cheaper goods, new jobs, shared science and culture.
- Problems: a crisis in one country can spread everywhere, local firms face strong foreign rivals, and local traditions can fade.
How the three changes connect
The three changes are not separate. They feed one another.
- Ageing means fewer workers.
- The information society offers robots, AI and online services to fill the gap.
- Globalisation brings workers, students and ideas from other countries.
- Society then needs new rules, new skills and lifelong learning, plus care for people who find change hard.
Good citizens ask: who gains from a change, who is left out, and what can we do together?
Try it yourself
At home: ask a grandparent how shopping, school or travel was when they were young. Write three differences. Then tick which change (old, online, overseas) explains each one.
In the 3D: in the last step, slide the older people to 35 and predict how many robots are needed to fill all 60 jobs. Then check.
Key formulas and definitions
- Replacement level: about 2.1 children per woman keeps a population steady
- Share of older people (%) = (people aged 65 and over) รท (all people) ร 100
- Workers = all people โ children โ older people (in a simple model)
Worked examples
1. A town has 200 people. 50 are aged 65 or over. What is the share of older people?
50 รท 200 ร 100 = 25%. One person in four is old, so this is a very aged town.
2. In a toy town of 100 people, 15 are children and 30 are aged 65+. How many are workers?
Workers = 100 โ 15 โ 30 = 55. If there are 60 jobs, 5 jobs stay empty.
3. In the same toy town, 5 robots take over 5 jobs. Are all 60 jobs filled?
55 workers + 5 robots = 60. Yes, all jobs are filled. This shows how technology can fill the gap that ageing makes.
Common mistakes
- Thinking an ageing society means the population is falling. Ageing means the share of older people is rising, even if total people are growing.
- Thinking the information society only means using phones. It is about information becoming the main resource of work and life.
- Treating globalisation as only trade. It also moves people, money, ideas and even problems.
- Thinking one change has nothing to do with the others. Ageing, technology and globalisation push each other.