The point of departure is that, initially, the copyright to a work always vests in the natural person who has created the work.
Copyright vests in the natural person
A company or an employer can never be the original author – however, the company can, of course, enter into agreements with the author that gives the company the right to use the work in a certain way.
Only a human being can be an author. Even if you stick a brush in the hand of a chimpanzee and let the monkey paint a picture, the chimp can never obtain copyright protection.
An author does not need to be of a certain age to obtain exclusive rights to his or her creations. A child has the same exclusive rights as an adult.