I've just hit 30 a few months ago, and I intend to travel across Japan this year in October (1-18) starting from Tokyo (where I will be spending 7-8 days). Leaving Tokyo on 7 October, I'll be in Kanazawa, Takayama (for the festival), Hiroshima, Kyoto and Osaka. I may even attempt neighboring cities from Osaka. I have no preference for companionship really, free-spirited travelers of any age/gender are welcome to tag along.
I'm an Indian guy who's moved to New Zealand now. I work as a train engineer, and as such I'll be travelling on Japan trains a lot :)