Our country is estimated to face an immense gap of 515,000 workers in 2050 due to ominous demographic developments and especially the decline in the number of workers aged 20-64 years. And even this probability is reversed by an increase in migration flows of 700,000 people, the picture of a few workers contributing for many pensioners is not considered easy to change. A study by the Institute for Demographic Research and Studies (IDEM) comes to this extremely worrying conclusion, noting that all recent projections of Greece's population for 2025-2050 converge on the fact that, given the irreversible negative birth-death balance, Greece's total population will decline, while those aged 65 and over will be the only age group that will increase. Adopting the scenario of almost zero immigration (48,200 for the period 2025-2049), an increase in life expectancy by almost four years (to 83.7 men and 88.1 for women in 2050) and fertility rates of 1.4-1.5 children per woman, the main conclusion is that in 2050 there will be a decrease in the total population by 1.36 million (8.935 million instead of 10.293 million in 2025), a decrease in the 20-64 age group (8.935 million instead of 10.293 million in 2025), a decrease in the number of people aged 20-64 years and a decrease in the number of women aged 20-64 years. by almost 1.68 million (4.27 million in 2050 instead of 5.95 million in 2025), while 65 and over will increase by about 700,000 (3.15 million in 2050 compared to 2.45 million today). Under this scenario, in 2050 there will be only 1.35 persons aged 20- 64 for every person aged 65 and over instead of 2.43 today. Even so, while under certain conditions it seems possible , despite the decline in the population aged 20- 64, the number of employed persons in this age will not decrease in 2050, the ratio of employed persons to persons aged 65 is unlikely to remain the same as today.