My DD is 5 and has been studying the piano for about a year and is about to do her first graded exams.
However, despite being a beginner she can play almost any melody she hears by ear immediately without much guess work. She can't add in the chords as accurately (though she tries) but any melody from any genre seems fine and she likes to then play them in different keys by transposing them once she's figured them out for fun.
She also likes to improvise, particularly with her teacher and the results are bad in that it sounds like music rather than noise.
Is this unusual or am I just not familiar with what's typical for a generally musical child?