4YOS500 trouble

This morning I wanted to drive to lab, but my car won't start. The battery has gone flat! :( Anyway, the battery is pretty old, I got it back in 2001, when I was still in Florida. I had AAA came and change the battery for me. I can't believe I have used AAA services to tow my car twice in the past 2 years, and now, this. I definitely got all my AAA dues worth! :) All is good now, and I have my car back! Soon, I will get a new car when I graduate and have a job...