15.6% are between 10 and 19. Of the adult population, 265 people or 13.0% of the population are between 20 and 29 years old. 247 people or 12.1% are between 30 and 39, 351 people or 17.2% are between 40 and 49, and 277 people or 13.6% are between 50 and 59. The senior population distribution is 191 people or 9.4% of the population are between 60 and 69 years old, 112 people or 5.5% are between 70 and 79, there are 65 people or 3.2% who are between 80 and 89, and there are 8 people or 0.4% who are 90 and older. , there were 708 private households in the municipality, and an average of 2.7 persons per household. there were 348 single family homes (or 84.3% of the total) out of a total of 413 inhabited buildings. There were 28 two family buildings (6.8%), 16 three family buildings (3.9%) and 21 multi-family buildings (or 5.1%). There were 392 (or 20.2%) persons who were part of a couple without children, and 1,189 (or 61.2%) who were part of a couple with children. There were 100 (or 5.1%) people who lived in single parent home, while there are 14 persons who were adult children living with one or both parents, 4 persons who lived in a household made up of relatives, 19 who lived in a household made up of unrelated persons, and 40 who are either institutionalized or live in another type of collective housing. The vacancy rate for the municipality, , was 0.83%. , the construction rate of new housing units was 4.9 new units per 1000 residents. there were 793 apartments in the municipality. The most common apartment size was the 6 room apartment of which there were 201. There were 20 single room apartments and 201 apartments with six or more rooms. the average price to rent an average apartment in Zihlschlacht-Sitterdorf was 991.74 Swiss francs (CHF) per month (US$790, £450, €630 approx. exchange rate from 2000). The average rate for a one-room apartment was 489.44 CHF (US$390, £220, €310), a two-room apartment was about 697.81 CHF (US$560, £310, €450), a three-room apartment was about 814.07 CHF (US$650, £370, €520) and a six or more room apartment cost an average of 1591.38 CHF (US$1270, £720, €1020). The average apartment price in Zihlschlacht-Sitterdorf was 88.9% of the national average of 1116 CHF. In the 2007 federal