Should older children still have a curfew?

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My 19 year old had moved out a when he was 16, living with other friends, then his dad, he had dropped out of school,call me silly but I feel if you are grown up enough that you dont think you need school then you are too grown up to live at home. Well...the 4 months ago asked if he could move back, of course I said. Well he thinks I am treating him like a child since I told him with school starting for the other boys, during the week he has to be in and doors locked at 10. He seems to think I am being unfair and unreasonable, says adult children live with their parents all the time now and I should let him do what he wants. I may be old school but I told him this is my house and during the week if he cant make it home by 10 then the doors are locked and find somewhere else to sleep. He started to argue and I told he could find somewhere else to live if he wanted to do that, but this is my home and if he lives under my roof he has to follow my rules. Which include going to school, and being in at 10 during the week, so he has enrolled in a learning center to go to after work in order to get his diploma. I do like to state things in that manner but to me that is just plain respect, and if he cant have the respect for me then he can move on. I do not charge him rent or anything else for that matter. What is your take on "adult" but not so "adult" children living at home and rules?