Your brain cells act like a community for better or worse. Here is which neighbours will keep you young and which will make you age faster.

The key to a good neighbourhood is the people in it: it is made better by the annoyingly cheery do gooder who brings in your parcels, or worse by the grouchy neighbour who lets their dog poop outside your door.

The same is true of your brain. That is according to a new study finding, Brain cells function like a community. These cells, it turns out, can actively create a nurturing environment that builds up the health and resilience of their cell neighbours. But some cells act as bad neighbours, spreading stress and damage.