I am in my 30's and I've lived in Tokyo for several years - even though I'm originally from California. Tokyo is an amazing city.
I have heard some other gaijin complain about living here because of this or that problem, or they miss their home or whatever, but I haven't had second thoughts about living here.
If you have a chance to live in Tokyo, I recommend it - there are always so many things going on - so many clubs, so many events, so many awesome people.
