Learning a second language "boosts" brain-power, scientists believe.

Researchers from University College London studied the brains of 105 people - 80 of whom were bilingual.

They found learning other languages altered grey matter - the area of the brain which processes information - in the same way exercise builds muscles.

People who learned a second language at a younger age were also more likely to have more advanced grey matter than those who learned later, the team said.