from 2.5 billion to 6 billion. - Between 1950 and 2000, the world's population more than doubled, to 9 billion. - Over the next 50 years, the population will only increase , 5% of the population were over 65. - In 1950, , At 16%, - the population of the elderly will be at its highest ever., with 16% over the age of 65. - By 2050, the world's population will be old,, A sizeable minority (16%) of the population - will be old in 2050., from 5% in 1950 to 16% by 2050 - The proportion of the elderly will have tripled, with 44% under the age of 20. - In 1950, the world's population was young,, At 27%, - the proportion of young people in 2050 will be smallest ever., In 1950, just over half (51%) of the population - was of working age.,

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