What is the law in Pennsylvania regarding small children riding motorcycles?

According to the PD officer that's in my office, he says the only law is that children 17 and under must have helmets, but otherwise there aren't any other laws about children on motorcycles.

When is a child old enough to ride a motorcycle? Common sense dictates the answer to this question. The child should be old enough to maintain body control and body support while on the motorcycle,...

There is no age requirement. As long as they can reach the pegs and must wear a helmet.

There is no minimum age requirement to be a passenger on a motorcycle in PA. The only law is that a child must wear an approved helmet.

The child must wear a properly fitted DOT approved helmet, comfortably reach the passenger foot pegs/boards on the motorcycle, and eye protection if the motorcycle is not equipped with a windscreen...