I have a cousin when he was around 2yrs oldish he had a toy drumset. He knows how to bang it with a really light pair of toy sticks...I think that's what they mean by "He started playing at two years old." And by that, what they really mean was "He started playing at two years old, literally playing with it like any toddler does. At the moment he sees a drumset weather actual or a toy, he grabs the sticks and just bang it...with no tempo, no time signature, no click track, no metronome, and a lot more. Just literally, playing with it like any other toddler would have." Any kid could do that. Grab a pair of drum sticks at two years old and start making noise and later on claim that they started at two years old.