World population under 1 billion in 1750, climbed to 2 billion by 1930, by 2011 grown to nearly 7 billion. This is due to birth rates and death rates also migration.
factors that influence population structure:
1, Economic Growth 2, Migration 3, Conflict
Ageing population bring a number of challenges,
- healthcare costs and demands rise
- pressure on NHS
- cost of long term residential care
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