A seaside town and a London borough are bucking a nationwide trend of ageing which will see the average age of the population hit its forties by 2037 . Towns and cities across the country are getting older , thanks to people living longer , with half of those born after 2007 expected to live to over 100 . While the average age of the population will be 43 in 2037 , up from 36 in 1992 , the the London Borough of Barking and Dagenham , and the seaside town of Bournemouth in Dorset , populations are getting younger . In Barking , the average age is set to drop from 34 to 33.4 during the 45 year period- thanks to rising birth rates and the influx of young Londoners with families looking to get on the housing ladder . By 2037 , a quarter of all residents in the borough will be under 16 years old . The county of Dorset has one of the oldest populations in the UK - Christchurch where almost 31 per cent of the population are pensioners- and one of the few places where the population is getting younger - Bournemouth where the age is due to drop from 41.3 to 41 . Bournemouth ( pictured ) is one of only two places in the UK where the age of the population is due to drop by 2037 . The fastest ageing areas were in rural Scotland where Eilean Siar ( pictured ) in the Western Isles 's average age of 38.5 is set to increase to 55.7 - a 31 per cent increase . The past decade has seen an influx of young professionals and migrants to the seaside town . Britain 's towns and cities are getting older as a national trend of ageing is set to put the UK 's average age at 43 . The fastest ageing areas were in rural Scotland where Eilean Siar in the Western Isles 's average age of 38.5 is set to increase to 55.7 - a 31 per cent increase . It will mean there will be fewer than one in seven will be under 16 by 2037 . Inverclyde 's population will age by 5.3 years while Clackmannanshire , the third fastest ageing location , will increase from a median of 35.4 to 49.5 . Experts are now warning that the rapidly ageing populations in rural Scotland could mean services such as doctors and schools come under threat . Professor Robert Wright , a population expert at Strathclyde University , told The Independent : . 'The issue is that depopulation and rapid population ageing of more-remote regions means that it will become too expensive to provide services needed by an ageing population . Basically , people will need to move to receive them . ' The oldest parts towns and cities in Britain will be Rother in Sussex , and north Norfolk , where the median age will exceed 57 by 2037 . In contrast , the areas of the UK which are slowest to age include Southampton , Bristol , Nottingham and Norwich . Location 1992 2037 . Eilean Siar ( Western Isles ) 38.5 55.7 . Inverclyde 35.9 51.2 . Clackmannanshire 35.4 49.5 . Rutland 37 51.7 . Suffolk Coastal 39.3 55 . Shetland Islands 34.7 47.9 . North Ayrshire 35.9 49.2 . Cherwell 32.8 44.8 . Gosport 33.5 45.7 . Tamworth 32.3 44.0 . Location 1992 2037 . Barking and Dagenham 34 33.4 . Bournemouth 41.3 41 . Southampton 33.9 34.1 . Bristol 34.2 34.5 . Nottingham 31.5 31.9 . Norwich 34.2 35.5 . Coventry 33.7 35 . Redbridge 35.3 36.7 . Manchester 30.7 32.3 . Brighton and Hove 36.9 38.7 .
General population growth will normally see average age increase by 2037 . Within 45 years , population in Inverclyde will age by 5.3 years to 51.2 . But in London the average age in Barking will have dropped from 33 to 33.4 . The seaside town of Bournemouth population will decrease from 41.3 to 41 . Town with the oldest population in the UK is Christchurch in 1851 .