I was 20. My last night in my dad's house was two nights before my wedding. Although I was living an independent life and even staying the weekends at my fiancès house at the time, I still lived at home. My sister did the same thing, only she was 21.

Funny thing was is I still had a curfew the last night I stayed there! My dad didn't like to go to bed without knowing we were somewhere safe, so he always asked that we be home in time for him to go to bed on time. He let me do whatever I wanted otherwise so I made sure to never miss curfew.
My dad figured I would stay at my fiancès house that night, since I would be staying at my grandmas the night before the wedding. He was surprised when I came home. It was just me and him in the house at that time and I wanted one last night with him. It was special. He was happy to see me.

What about you? How old were you when you moved out?