When are grown children EVER so move out of their parents house?

I know this very sweet girl ever so much but she is still living with her dad and she is 28 (29 in October) and I just think it is ever so weird that a 28 year old grown person still lives with their parents. Grown people need to be on their own and kindly give their parents a break. I know most parents can't wait for their grown kids to leave. I moved out when I was 19 and I'm ever so grand that I did. I live with my best friend. This girl is too attached to her dad sometimes which is ever so sweet but she needs to ever so learn to live on her own because I can tell she is capable. She goes to college and has a part time job and working independently. Her autism and down syndrome shouldn't stop her from moving out.