I moved out the day I turned 18. Got an apartment with a friend and worked full time. The apartment was only the next town over. I did move back home for about 8 months right before I got married to save money for my wedding etc.
My 22 year old daughter is still living at home, 24 year old son has been living with his fiancee for 2 years and my youngest is going about an hour away to school in August. As long as they are in school, I have no problem with them living at home, after that they should be independent enough to be on their own.