stringing out the court date until after you are 21 wont do you any good. You still committed the offense before you turned 21.

On top of the suspension, the 7k+ in fines and legal fees you will also have the increased insurance when you do get your license back. A guy that worked for me had to sell his car and pick up a beater because his insurance more than doubled after his DUI. He was also 20 and less than 2 months from his 21st.