Youth is energetic and exuberant. Age sometimes relishes tranquillity. The interface between the two is not always easy.
'Peace and quiet' is a value. It is perfectly legitimate to request it. You may have a right to make a noise but you do not have a right to impose the noise on others (as with smoking). So it is a matter of quietening down or going somewhere else- if that is possible.

There may be households which insist on quietness all the time. That may be rather restricting if there is no place to go to make a noise.

The code is a request, from time to time, for peace and quiet Overuse of the code diminishes its value.

'Some 8/19 please.' The strangeness and directness of the code may be more compelling than just asking for quiet.