They are at least a month old. I love making hard boiled eggs and also pickled eggs.
My aunt that pokes the holes in each egg, hard boils them when they are about a week old.
It has to do with the freshness of the eggs.
My aunt uses a pin to poke a small hole in the ends of each egg. She swears by this.
I just hard boil my older eggs and they peal nicely.