The retirement of the Baby Boomer generation is beginning to reshape Sydney's economy as jobs growth dwindles in some of the city's most affluent suburbs.

The number of workers living in the Eastern Suburbs, the North Shore and the Ryde region fell in the year to November, exclusive analysis of local area jobs figures shows. Those areas also had some of the nation's lowest unemployment rates.

Terry Rawnsley, a regional economics expert with SGS Economics and Planning, who did the research, said the ageing of the population had contributed to this trend.

"The labour markets in those regions are strong with high participation and very low unemployment," he said. "This suggests the fall in employment is being driven more by demographic factors, such as Baby Boomers leaving the labour force, than by economic weakness."