The GP workforce over 55 varies eight-fold across England, with more than two fifths of GPs in some areas in this age group.
Some 42% of GPs working in Southend CCG are over the age of 55, as are 40% in Havering CCG and in Castle Point and Rochford CCG.
But this compares with just 5% in Hardwicke CCG, 10% in Blackpool CCG and 11% in Harrogate and Rural District CCG.
A poll carried out by the BMA in 2015 showed that one in three GPs were considering retirement within five years.
Map: Proportion of GP workforce over 55
Across England, a total of 21% of the GP workforce are over 55 – of those whose ages are known – which remains unchanged since 2015.
The statistics, published by NHS Digital, show that one in four (25%) GPs in London are over 55, compared to 22% in the Midlands and East, 21% in the South of England NHS region and 20% in the North of England.
The capital also has significantly more GPs over 65 than anywhere else in the country, who account for 8% of the workforce. This is twice as high as in the Midlands and East (4%) and much more than in the South (3%) and the North (2%).