A G8 summit will take place at Gleneagles in Scotland in July

The UK is currently chairing the group, comprising seven of the world's leading industrialised nations, and Russia.

All G8 nations have working populations that are declining as a percentage of their overall populations.

The ministers will be looking at how to raise employment rates, particularly among older workers.

"All countries need to face up to the consequences of an ageing society," said UK pensions minister Alan Johnson.

"A declining working age population means we need to redouble our efforts to get as many people in employment as possible so they are able to save and plan for their retirement."

Many developing nations, however, are facing a different kind of demographic change and the problem of youth unemployment there will also be on the agenda.

A G8 summit will see the leaders of the UK, Canada, France, Germany, Italy, Japan, Russia and the US, gather at Gleneagles in Scotland in July.