I love this! :}

I can't wait for the next page! :}

Quoting

but how do their ages compare to human ages?

Let's see it like this...

For full youkai, divide by 20
For hanyou, divide by 6

This will make them:
Hideaki: ~17
Sesshomaru: ~15
Kagome: ~9

Hanyou grow up faster. If in the anime Izayoi died 150 years ago, and Inuyasha slept 50...so his 'looks' are from a hundred years of growth. He look 15-18ish...so... more or less.

Sesshomaru is not the 'original' age as from the anime. Im not entirely sure about his age but I know he's older.

Your use of color always makes such a wonderful contrast. I luff this so much.