Age at giving birth in Norway

This weekend, in the newspaper Dagbladet, the following information was given:
1. Norwegian women, on the average, get older and older before they give birth to their first child.
2. The average age for a Norwegian woman to give birth to her first baby was 28,1 years in the year 2007.
3. Few teenagers give birth today in Norway. Less than 1 out of 20 women give birth before the age of 20.