Two groups of people in this new society, the healthy people and the old/vulnerable.
The society within a society idea can work but we will need to have ID cards to make sure we know who is who.
The society within (over 65's and vulnerable) will not be allowed to go into pubs, restaurants, public buildings like museums, libraries, the work place etc. shopping centres, sports stadiums and on and on. This way we can protect and shield them and at the same time go about our lives as normal.