1. Younger, around 10 or so. Haru is the mission and protecting him will be the PC's task for some time. If we was in his late teens, he'd be taking command, which would be troublesome for adventure purposes.
2. No, I specifically wanted to be vague about location and time period, and tried to make it so that it would anywhere, and almost any time.
3. Except for the enemy's territory being near-by, no. My assumption is that over the next few adventures the PCs will be trying to put as much distance between them and the enemy as possible.