aged 10+
There's no real time passage between Tekken 4 - 6, so Kazuya is the same age. 49 years old.
I think he's still 19 when he was is Tekken Tag Tournament. I don't really know if he was really 19 because the game is only non-canon or the game is not included in the Tekken story. Hope I answered it for you! =P
the dark age the dark age
Yes, both of them are currently (in the Tekken Universe), 48.
Dark Age of Reason was created in 1996.
The Dark Age was created on 1997-11-10.
Dark Age Ahead was created in 2004.
Dark Age - band - was created in 1994.
Dark Age of Camelot happened in 2001.
It was dark
The New Dark Age was created on 2008-03-12.
Power Piggs of the Dark Age happened in 1996.