Teenagers without middle fingers make do. Talita and Sorrel are both about 14 years old here.
The Garriton District is one of a couple dozen cylinder districts in Nexus Jovia, a sprawling space station megacity in orbit of Jupiter. Since the sun is too far away to provide a meaningful amount of energy, Nexus Jovia gets most of its power from tethers that extend out into Jupiter’s beefy electromagnetic field. The spokes of the cylinder are part of the transportation system, and have cars that use inertia to take passengers from one side of the cylinder to the other.