How can we find out if it's possible to get an old crime expunged off of my husband's record?

My husband is 43 years old and has a Probation Before Judgement charge on his record from when he was approximately 19 years old. It was a Burglary - 2nd degree (converted degree) charge with a guilty plea and he did minimal time due to not having bail money. We live in Pennsylvania, but he lived in Baltimore, Maryland when the case was tried. We are wondering if it is possible to remove the charge from his record and/or if not, we need to find information regarding what it really means for his life? Is this considered a felony? Is he able to get a passport, leave the country, etc? Thank you for your time.