The given graph illustrates and predicts the proportion of New Zealand’s resident divided into four age group, over a 100-year period from 1950 to 2050.
Overall, it is clear that people aged over 65 has been the largest group over time, included the predicted future. Another notable point is that while there is a downward trend in the number of people who 25-37 years old and 38-45 years old, the percentage of teenager under 14 years old have witnessed an upward trend.
Looking at the detail, in 1950, the 38-45 age group made up about 25% of New Zealand population, ranking second only to the over-65 group, which accounted for 60%. Both figures then reached their peak respectively at 50% and 70% in 1990 before started to decline.
Turning into younger groups, people at the age of 0-14 only represent 5% the population of New Zeland by 1950. However, the trend has risen significantly since 1990 and is expected to reach 20% in 2050. By contrast, the 25-37 age group has experienced a gradual decrease over the same period. It first started at 20% in 1950, slightly increase in 1960 but then dropped considerably to 10% by 2000 and is likely to hit the lowest point by 2050.