ISBN-13: 9780415268233 / Angielski / Miękka / 2003 / 190 str.
ISBN-13: 9780415268233 / Angielski / Miękka / 2003 / 190 str.
The latter decades of the 20th century saw a fundamental change in the age structure of many Western societies. In these societies it is now common for a fifth to a quarter of the population to be retired, for fewer babies to be born than is required to sustain the size of the population and for life expectancy to exceed 80 years old.