Since the mask you wear actually only helps the others around you and seeing that the younger ones are those who often don't show symptoms,
I think it should be the other way around.
And after three weeks of Corona teaching I can relate from experience that students don't give a fig about social distancing. Even that year group that was considered to be capable of doing so, according to our government (steered by those virologists, of course).
It's not happening. Full stop.
They carry on with their lifes as if nothing ever happened (social media is a great tool sometimes...)
But life is a risk in itself. And after a while you "forget" about the danger, even if you still keep your distance and even if you still reprimand your students for not doing so