It looks modern as far as the handle and twine goes but the blade might be old. Someone will come along soon and give more thoughts on it. It's really cool though.
Pretty cool. That looks a whole lot like artificial sinew, which would date it to modern times. Hard to say just from a pic, but artificial sinew has a more waxy feel than real sinew. Is it just for decoration or does it actually bind the ax head to the handle? I use artificial sinew on different projects, but I would have used rawhide to bind the ax head to the handle on this. That's all I can tell you about it.