Mario Draghi urged euro leaders to make changes to labour markets, as the bloc's economy continues to struggle with low growth and high unemployment.
The chief said ageing populations are a huge problem for the jobs market that will start to hack away at the eurozone's potential in the coming years.
Speaking in Brussels today, Mr Draghi said: “We cannot avoid the fact that, over time, the inherent speed limits resulting from the euro area’s unfavourable demographics will start to bite.”
He said governments must now take steps to improve productivity of workers and increase the amount of people in employment.
It comes as France faces huge opposition and protest in making labour reforms that would make it easier for employers to hire and fire workers.
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