Why more trees and greenery may help us to live healthier into old age

It feels like common sense to plant trees, grow plants and flowers and centre green spaces in neighbourhood planning. The pay offs for mental and physical health have been stated time and again. 

The latest in what call  "It can't hurt to try when planning neighbourhoods" links is a photo via Mental Floss (which unfortunately doesn't tell us which study) which suggests that if we add trees to our urban environments it can keep people healthier for longer.

and a link to a report in the Independent on a study that greenery and trees may help to stave off dementia here

Greening a neighbourhood helps us stay healthier as we age. What's not to like?