I know "staying away from people over 55" seems logical, but it hasn't been possible in practice to segregate by age. The problem is transistive closure.
For example, in aged-care homes, the workers live in the general community, and if the virus is in the community, they get it and pass it on. Could the workers be segregated, in a bubble with the aged-care home? Their outside life would be cut off: the above social/services/supplies. Should their own families be with them in the bubble - or cut off from them? Where do you draw the line? Can it be drawn?
This same issue of transistive closure occurs for all over 55. Everyone is connected, and an epidemic follows those connections. This has been better put:
No man is an island entire of itself; every man
is a piece of the continent, a part of the main;
if a clod be washed away by the sea, Europe
is the less, as well as if a promontory were, as
well as any manner of thy friends or of thine
own were; any man's death diminishes me,
because I am involved in mankind.
And therefore never send to know for whom
the bell tolls; it tolls for thee.