Does talent exist?
Whether talent exists or not, talent is not the defining factor of how far your child can go with learning to play the guitar.
I want to raise an example of an individual that many have named one of the most talented young musician ever produced. Mozart.
Mozart was born and consumed by music since the moment he was born. From the age of four, he begged for his father to teach him piano because his sister had been playing already. This was this way of gaining affection from his father who is a music instructor.
In two short years, he had already started touring with his sister.