Which Martial Art

When I was younger, I took Tae Kwon Do. As I've gotten older, and become more of Eastern thought and Philosophy, I would like to study a martial art again.

Im 68 about 260. I want an art thats flowing, and that builds agility. I have also taken basic Ninjitsu, but would like more of a striking art.

The most important thing is that I dont want it Americanized, not some fortune cookie crap. So, that having been said, anyone able to offer advice on which art to take?

thanks.