1. Children are more creative
2. Adults are smarter in noticing musical pattern
3. Because adults have a more developed brain, they could see and implement various themes and patterns in their composition
4. Adults are more mature internet and technology user, so they will have easier time with music software. They could play notes by trial and error and compose pieces without needing an actual instrument.
5. Adults are more patient with the composition project, but they generally have less leisure time than children.
6. If children are skilled in improvisation, they will have advantage over adults in the number of compositions. A prolific composer that is.