"This is going to cause real problems in the labour market, in the pensions system, in medical care."The reasons for Greece's demographic decline are varied.Like many developed countries, Greece's birth rate has been falling for decades, and now sits at just 1.3 children per woman, well below the "replacement rate" of 2.1 demographers say is necessary for a stable population.In recent years, the country has seen nearly twice as many deaths as births.But Greece's predicament has also been turbo-charged by its recent history, not least the years of political and economic turmoil following the 2009 debt crisis.As youth unemployment hit nearly 60 per cent, it is estimated half-a-million mostly young Greeks fled the country for better prospects overseas, with many never returning.Professor Tragaki says the crisis not only robbed Greece of a large cohort of reproductive-aged citizens, but it also produced a generation that is "less optimistic about the future"."Having children means you believe in the future and you invest in the future," she says.Klairi Sacha, 37, was among those who left Greece at the peak of the debt crisis, moving to London to start her career."It was honestly a traumatising experience," she says Having a family has become more difficult."Over half the population of Greece now live in and around the crammed and often grid-locked capital. But it is a different story in regional Greece, where some places are now seeing an acute shortage of children.In the hills of Arcadia, not far from Lasta, farmers Nikki and Jon have watched the slow demise of their village over the past decade.Limni's bank, police station and dentist have all closed.Gone, too, are the children