West Somerset has the highest average age in the UK at 52, with almost three-in-10 people there aged over 65, a population survey has revealed.
It is expected to rise to 56 by 2018 as people continue to retire to the coast.
North Norfolk comes next at almost 51, followed by Rother, Christchurch and East Dorset on the south coast, the Office of National Statistics says.
The ONS has launched a mapping tool to chart UK age patterns, coinciding with this year's Older People's Day. read more
