Zorro is a mature male though you need to examine teeth to tell a koalas age. He usually has quite a wrinkled face, maybe he's been taking care of himself lately ;)
Thank you for all the comments on my project, much appreciated
@milaniet koala fur is very soft and also very dense. I know this from handling koalas in care at Friends of the Koala care centre where I am a volunteer though, not from every getting close enough to pat one on the property :) koala teeth and claws are also very sharp ... thanks for asking!