The youngest billionaires in the world in 2018

 Katharina Andresen, from Norway, made headlines in 2017 when she was fined 250,000 kroner (£23,000) after she was caught driving under the influence of alcohol.
She is the world’s second youngest billionaire — only her sister Alexandra, 21, is younger.

2. Katharina Andresen, 22 — $1.4 billion (£1 billion).