You may be considered a first-time DUI offender even if you technically have a previous DUI conviction on your record. Pennsylvania’s lookback period for driving under the influence is typically 10 years. If you have one DUI conviction within the previous 10 years, then this arrest will be a second DUI. However, if your prior conviction was for an arrest that occurred more than 10 years ago, then this arrest is a new first DUI. For example, you may be in your 40s and facing a DUI charge. A DUI conviction that took place when you were 22 years old may not impact this offense. You will instead face a first-time DUI.