I'd bet 0.05 BTC he is over 40.
I think he could actually be under 30, honestly. Though no younger than 24.
edit:
On second thought I'm not that sure about him living in the US either, in part due to some of his use of British spellings.
I'll change that to "lives in the US, Canada, Britain, Australia, or New Zealand".
edit: I'm not sure if I was downvoted because I failed to notice the person I was replying to was joking, or for some other reason.
There's also always the chance his parents are Japanese but he was born in an English-speaking country, but I think considering the fact he clearly wanted to hide his identity, he probably picked a name that was unrelated to his true nationality and ethnicity.