@cracking-I think a lot of kids choose to stay home through college to save money. If that works out for both you and your son, then there's nothing strange or wrong with that. If your girls are of a different mindset and want to move out sooner, then I think that's fine too. Just siblings making different choices. I do think the girls should learn to drive and do so if they want to, for their own independence. That's just my opinion though, and should be a family decision.
As far as your apartment, if you like where you live, and the landlord is friendly to talk to, maybe you could ask him about the possibility of purchasing some of your own appliances with the understanding that they are yours? Your responsibility to repair and upkeep, but also yours to take with you if you move. And get it in writing. Maybe just worth asking him about.