Annexe D of BS 5839 pt 6: 2013 has all sorts of suggestions but all depending on your situation ... presumably a block of sheltered flats?
Does the alarm go to an agency of sorts that opens up voice communications to the resident or is this direct to an ARC?
In practical terms I can only think of telling the agent / ARC you are going to test and take the system off line - but if you've got dozens of flats and asking elderly residents to do this then I foresee several problems !!
Or you have an isolation facility but again, this needs to come back on automatically after a short period.
Or you employ someone specifically to carry out the weekly test as you might employ a firm to do the weekly call point test on fire system where there is no on site responsible person?