It happened at 11:33 a.m. Thursday in the 2700 block of Levick Street in Northeast Philadelphia.
Police say the attacker hit the elderly resident, robbed him of his wallet and $200, then fled.
The victim was taken to Nazareth Hospital to be evaluated and treated for a cut lip.
Police are looking for an Hispanic man, about 30 years old, 5 feet 10 inches tall, weighing 180-200 pounds.
Anyone with information about this case is asked to contact Philadelphia Police by dialing 911.
