Well dead people are not removed from the registers. There is a graph which I ca't find now that shows that the 70+ category in the electoral register is not only the largest but also larger than the 40-70 combined! My father (who died in 1997) and my uncle (who died in 1990) are still in the registers.

Add to that the fact that there are people in the registers who have emmigrated from Greece in the 50s-70s who are for all practical purposes foreign nationals but who still retain their citizenship and thus the right to vote. I made a brief calculation a few years ago using the available census data and I estimated that the actual people >18 living in Greece and having a right to vote is ~8,5 million

The road of excess leads to the palace of wisdom - William Blake