The youngest billionaire teenage horse rider

Alexandra Andresen was handed $1.2 billion at the age of 19 and has made it into the Forbes magazine as someone worth at least one billion dollars.

It is the first time the dressage competitor, who is from Norway, appeared on the list – along with her 20-year-old sister Katharina.

The pair totted up as the 1,475th richest people in the world.

The girls had a lucky break when their father Johan F Andresen transferred 80 per cent of his stake in private equity firm Ferd Holdings, to his daughters in 2007.

The company sold for $500 million in 2005 and the money was re-invested in property and hedge funds.

The Andresen’s became wealthy while working in the tobacco industry, and Alexandra’s great, great, great grandfather founded the biggest producer in Norway.

After the sisters turned 17 they were required to make their tax returns and personal wealth public.

Alexandra said: ‘I feel a great responsibility.

“In a way I think that I have not made me deserving of this, while I want to help develop Ferd and make it even better.

“Finding a way to give something back, I think is difficult

“The fact that my family has resources has given me many opportunities, especially in the riding, because it requires a lot of capital.

“But it is not enough to have money to succeed.”