BBC NEWS | Health | 'Brain decline' begins at age 27

BBC NEWS | Health | 'Brain decline' begins at age 27: "Mental powers start to dwindle at 27 after peaking at 22, marking the start of old age, US research suggests.

Professor Timothy Salthouse of Virginia University found reasoning, speed of thought and spatial visualisation all decline in our late 20s.

Therapies designed to stall or reverse the ageing process may need to start much earlier, he said."