First there was the “boomerang generation”, the millions of people in their 20s and early 30s starting adult life by moving back in with their parents because of the cost of housing.
But another, perhaps rather more unexpected, section of the British public has also begun to give serious consideration to doing the same thing: elderly people.
Dramatic improvements in life expectancy in recent years mean the unheard of prospect of someone entering their 80s still fortunate enough to have parents living is a reality for many.
Now operators of retirement villages have noticed a small but growing trend for new elderly residents to move in – accompanied by their own, even more elderly, parents.
According to the most recent official estimates, the number of people over the age of 70 in the UK has risen by 15 per cent in a decade to just under eight million.
But the ranks of those over the age of 100 have swollen by almost three quarters in the same period, with around 14,450 centenarians living in the UK last year.