Developers should build for the elderly to downsize

It is frequently suggested that elderly people living — sometimes alone — in family homes should be ‘downsizing’ and freeing up the housing stock for families. But where are we to go?
There comes a time, especially now we are all living longer, when the house is too big, costs too much to run, and the garden gets neglected. But independence is important and we may have the security of neighbours to call on if there is a problem.