If you were convicted of drunk driving or DUI in Pennsylvania, there would be very limited circumstances where a person would be eligible for an expungement. A misdemeanor offense or a felony offense can only be expunged if the person is 70 years of age and other conditions are met, or if they're deceased and other conditions are met.
A misdemeanor DUI conviction maybe will be sealed if 10 years have passed and the person has remained arrest and prosecution free. A felony can never be sealed. In most instances, a DUI is a misdemeanor.
If the person was not convicted for the DUI, say, and resolve the case through ARD, then they would be prospectively eligible to get their case expunged, or say if they were charged with a DUI and if they were not convicted, for example, if the charges were dismissed or withdrawn, or if the person was found not guilty, the person would be eligible to get the DUI record expunged.
It is a nuanced consideration in terms of a person's eligibility, and an experienced Pennsylvania criminal defense attorney would be able to help you best understand your eligibility and what would be most appropriate in terms of getting your record cleared up.