Yes... And this is what you we are asked to do to maintain a good legal standing with the state of Pennsylvania:

  
Establishments that serve / sell alcoholic beverages are required to request ID from any customer who appears to be 30 years of age or under.

Acceptable ID’s As Required by the State Of Pennsylvania

A valid photo driver’s license issued from Pennsylvania Department of Transportation or any other state.

A valid photo identification card from Pennsylvania Department of Transportation or any other state.

A valid Armed Forces Identification with photo.

A valid passport or travel visa containing the holder’s photograph.

(The above requirements are provided by the Pennsylvania Liquor Control Board & PA State Police)

Just to play it safe we will ID pretty much everyone that walks through the door... Even Santa Claus!   ;)

If you can have this stuff on you --- just in case --- It would be most helpful for all.