Real Estate Law
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If the house has been there for at least 21 years, then there should be a claim of adverse possession that would allow you to own/claim ownership of the portion of the property that extends 5 feet across the property line. Here's a good link that outlines the law of adverse possession in PA: http://statelaws.findlaw.com/pennsylvania-law/pennsylvania-adverse-possession-laws.html
That said, in order to gain a clear title under adverse possession, you would have to file a petition in court for adverse possession and ask the judge to confirm that you own the property outright and obtain a court order that gives you that ownership.
If you're negotiating the purchase of the property, you may be best served by asking the seller to get the title confirmed through adverse possession before you buy it to ensure that you are getting what you believe you are/what you want.