Greece currently has a fertility rate of only 1.3, and the effects are already kicking in. This year more than 700 schools (out of 13,000 total) will close because they do not have 15 students to remain viable. To be fair, the minimum student requirement has been rising, meaning the huge numbers are a bit misleading. Even so:
…the student population is expected to be approximately 1.21 million for the 2025-2026 academic year, a drop of over 150,000 students since 2018-2019.
Although predictably the schools are mostly rural, some are even urban, and even in Athens.
Along with the low fertility rate, people are also emigrating for financial reasons, adding to the problem