Well guys I have a cousin in Greece who used to be so nice to send me every year with the traditional Christmas greetings card a banknote of 5, 10, 20 or 50 dollars. There are about 300 dollars in all and I didn't spend them, just kept them for black days.
These days a friend is going abroad and bought some dollars. I was surprised to see that the usual " greens" ( as we used to call them when it was illegal to own foreign currency ) have a new design and have different colours.

My question is if the old money I got ( series before 1999 ) are still in use. Otherwise I must exchange them to a bank but it means I may lose a part of them.