 The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 2 and the non-Swiss population increased by 1 people.This represents a population growth rate of -0.4%.The age distribution, , in Häfelfingen is; 14 children or 5.2% of the population are between 0 and 6 years old and 55 teenagers or 20.4% are between 7 and 19.