Are you confident and competent with bike DIY. If so then older might be okay. Some old components take some research to find compatible replacements for things no longer made. And some, maybe many bike shops find that time not worth their effort since you probably won't want to pay for hours of investigation.
Regardless, I'd go with a newer bike if you can get one in your budget. If this is your first road bike, then don't spend a wad on it. You'll need two or three more road bikes to really learn what you like and don't like about the minor differences.