I think to be on the safe side, I'd go ahead and just renew it. Now, I have a question.....a passport is good for 10 years, it should be good to the day before it expires, right? If your drivers license expires, you have til that actual date to get a new one, what is it with passports anyway??
Just get a new one, especially if you do plan on traveling at some point, then you will be ready to go and no hassles.