the vast majority of kids are keen
the vast majority of kids is keen .... here the subject becomes "majority"
and male younger people tend to be more interested in indoor and outdoor games than female friends are
.... better say "male children"
Overall, the vast majority of kids are keen on indoor audio-visual entertainments and male younger people tend to be more interested in indoor and outdoor games than female friends are.
I feel this sentence is too long and you better break it to two. That would improve its presentation and clarity. : )
in all the Australian children's eyes
I wish if you said it in a more simple tone;
with all Australian children