The youngest person to circumnavigate the world was 16-year old Laura Dekker.
You can change the color and style of the tracking trace or any other map trace.
Click on to display additional options and click on Settings
You can then edit the name of the trace, its style and color. The name of the trace is currently only used in the administration so that you can organize your multiple traces if necessary.
Click on the "Save" button to update the map.