Moving out

What age should your kids move out? I need outside perspective on this. I'm getting a lot of crap for my oldest still living at home.

So my daughter is 19 and her bf is 20 he moved in this past summer, they both have jobs but have been struggling figuring out what to do with college and finding a career. My daughter has finally figured out what she wants to do and will be starting school soon. Her bf has a few job opportunities he's looking into which could turn into a career

My daughter helps out a lot with her younger siblings 9,6,4 she watches them so I can work, run errands, etc. I do pay her to babysit. (Single mom here) and her bf insists on paying rent, so he gives me rent every month and will help with meals.

But people around here have been really negative. Should I be encouraging them more to move out sooner? Am I holding them back? I was on my own at 16 so I know how.hard it is to juggle school and a job and rent is so expensive.