As we know, the majority of young people only tell time by looking at their mobile phone. Therefore, I doubt that they tap their wrists (their imaginary wristwatch) to indicate that somebody is late.
However, it seems that they still make an imaginary old fashioned telephone with their thumb and little finger held to their ear with the central fingers folded in to indicate that they will call or want to be called. Will this disappear some day?
I do know that in recent years it has become common to "type" a few letters in the palm of one's hand to promise or request a text message.
But maybe all sorts of gestures have been invented that I don't even know about. I suppose that those of you with grown children must have learned a few things.
Many of these hand gestures are learned in loud clubs or rock concerts with too many decibels when actually talking to each other is out of the question. Since I don't frequent these places anymore, I am totally obsolete.