The current youngest person to fly solo around the world record is 18: 163 year(s):day(s).
Flying around the world solo, in a single engined aircraft is not an easy task and requires extensive preparation, planning and training. Here is a little explanation of what is required to qualify for the World Record.
What is considered global circumnavigation?
Crossing all meridians is not considered global circumnavigation. If you walk completely around either Pole, you have crossed all meridians, but this is not generally considered a circumnavigation.
Flying round in a circle over the North Pole does not constitute a flight around the world. The flight must be made between the 2 Polar Circles (66.5° N and S 66.5° S).
What are requirements for circumnavigation by airplane?