Older people are going to make up a much larger proportion of the UK population in the future. The number of over 80s is set to more than double from 3m in 2012 to 6.1m in 2037.
The proportion of the UK population aged 75 and over will grow from 7.9% in 2012 to 13% in 2037. This will have the effect of driving the average age of someone in the UK up from 39.7 years in 2012 to 40.6 years in mid-2022 and 42.8 years by mid-2037.The figures also show a 31% growth in the number of people of state pension age putting it up to 16.1m in 2037.
57% of the projected 9.6 million population increase over the next 25 years is set to be driven by "projected natural increase", which essentially means there being more births than deaths.
The remaining 43% will be down to migration but, of course, people migrating to the UK also have an affect on the birth rate. Higher migration means more people of child-bearing age will be in the population. 29% of the 5.4m projected natural increase in the population size between 2012 and 2037 will be partially down to migration.
The figures are skewed quite heftily the other way in Scotland where 72% of the 206,000 projected increase in population over the next decade will be due to migration.
http://www.theguardian.com/news/datablog/2013/nov/06/uk-population-increase-births-migration
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