Ah, the joy of postcards!
Makes me think of part of my childhood when we were always moving around and traveling, and post cards were the way we always stayed in touch with the family back home. These days, there are many people in the world who have never actually received a post card, in their entire lives.
That's a bit sad, really!
That is indeed sad if someone has never received a postcard, and I see that it happens (from the comments in this post). Mostly younger generations.
I didn't travel a lot in my childhood to send those postcards from different places, but still, we were sending cards for holidays.