Population seven billion: The UK's ageing population

By the end of October 2011 the United Nations will announce that the world's population has reached seven billion.

The number of people on the planet is now rising by around 80 million a year.

But how are these changes affecting people's daily lives? BBC News speaks to seven people from around the world to hear their stories.

In the UK, as people live longer, the population is getting older.

The BBC's Naomi Grimley visited 85-year-old Helen Morse who still lives independently in a London suburb.