Strictly speaking, every science fiction tale presents its own version of future and therefore there are as many science fiction universes as there are science fiction stories. Many SF tales follow dictates of a particular subgenre like Cyberpunk or Space Opera of which, see the separate entry.
... household size is 3.21 and the average family size is 3.51.
In the town the population is spread out with 29.5% under the age of 18, 6.7% from 18 to 24, 33.6% from ...