the population of Swiss citizens increased by 5 while the foreign population increased by 1. There were 8 Swiss men and 12 Swiss women who immigrated back to Switzerland. At the same time, there were 6 non-Swiss men and 7 non-Swiss women who immigrated from another country to Switzerland. The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 55 and the non-Swiss population increased by 22 people. This represents a population growth rate of 5.6%. The age distribution, , in Penthaz is; 172 children or 11.6% of the population are between 0 and 9 years old and 189 teenagers or 12.8% are between 10 and 19. Of the adult population, 168 people or 11.4% of the population are between 20 and 29 years old. 241 people or 16.3% are between 30 and 39, 239 people or 16.1% are between 40 and 49, and 191 people or 12.9% are between 50 and 59. The senior population distribution is 179 people or 12.1% of the population are between 60 and 69 years old, 65 people or 4.4% are between 70 and 79, there are 30 people or 2.0% who are between 80 and 89, and there are 6 people or 0.4% who are 90 and older. , there were 516 people who were single and never married in the municipality. There were 650 married individuals, 47 widows or widowers and 74 individuals who are divorced. , there were 542 private households in the municipality, and an average of 2.3 persons per household. There were 156 households that consist of only one person and 19 households with five or more people. Out of a total of 549 households that answered this question, 28.4% were households made up of just one person. Of the rest of the households, there are 166 married couples without children, 186 married couples with children There were 25 single parents with a child or children. There were 9 households that were made up of unrelated people and 7 households that were made up of some sort of institution or another collective housing. there were 210 single family homes (or 72.9% of the total) out of a total of 288 inhabited buildings. There were 57 multi-family buildings (19.8%), along with 14 multi-purpose buildings that were mostly used for housing (4.9%) and 7 other use buildings (commercial or industrial) that also