Jin

mandatory official profile quoting

We are given very little statistical information about Jin. Observe:

Age: 20
Height: 180 cm ¹

Aside from that, there's also the little blurb the Adult Swim website gave him:

Jin is the perfect samurai, cold, calculating, precise with both his sword and his thoughts. He considers Mugen to be sloppy and boorish, but he is the only man Jin has not been able to kill.

Jin is cool-headed, indifferent to most things and content to give a simple "hm" in reply to his more talkative companions. He is the archetypical strong-and-silent lone wolf badass with his isolated mind, subtle personality and ability to radiate "piss me off and you're dead." He is the polar opposite of Mugen; the very definition of the traditional Eastern samurai.

Yet, Jin hides a lot beneath that quiet mask of his. Even though the one-shot nature of Samurai Champloo's episodes leave little room for in-depth development, the writers have managed -- with fitting subtlety -- to convey the unspoken qualities of Jin's past and present.

¹ This information came from a height chart. Jin's age was mentioned on some official profile, though I forgot where.