You'll be fine. I got my permit with an 11 year old 3rd degree assault and misdemenor criminal mischief charge. If I remember right as long as it's older than 7 or 8 years no biggie and like said above as long as it's not domestic violence. Everyone makes mistakes when they're young, just be glad it wasn't a felony or domestic violence.
Good thing you said something. I was about to run out and get some assault charges of my own.