Probably the reason your mother is worrying about you has little to do with your age and more to do with your "trouble with the law". You don't mention what that trouble was, so you're leaving much to the imagination, here.

I would agree that NORMALLY, 25yr olds go party to all hours of the night as they choose, BUT the time they want you home may not have so much to do with you partying out as it does with you disrupting their sleep coming in at the wee hours. If I have a late night with my friends my partner feels the same way -- alot of this is you choosing to be treated "like a child" instead of seeing the situation as a group of what should be MUTUALLY respectful adults. That means you have to respect your parents' wishes while you are in their home as you would expect any houseguest to respect YOUR way of life if it were your home.

Change your attitude and get your life together. For your date night, consider making alternate sleeping arrangements (and no, I don't mean THAT KIND)