Kiyoko's Astral Plane after-birth scenes compare the newborn's rapid growth to that of wraith-touched races/beings; IIRC*, the former is stated to be slower, but that's still a third of the way to adulthood in ~15 minutes. That would imply that wraith-touched creatures become adults less than an hour after birth. Still, given that there have been no actual wraiths since the Godswar (except for
the Seven, but they're not corrupting anything and thus can't be a source of wraith-touchedness), the fact that wraith-touched beings still exist means they either live very long lives or are capable of making more wraith-touched beings (hopefully, only through reproduction).
*EDIT: it also happens outside the Astral Plane. The text in question is:
Before your eyes, the newborn fox kit begins to grow rapidly, personality and nutrition alike flowing from Kiyoko's breast into your daughter. In the blink of an eye, Kiyoko is no longer cradling her newest child, but instead is supporting her on her lap as both of her breasts are drained in quick, hungry succession. At the same time, her leftover pregnant belly slowly shrinks back into nothingness, contracting in steady pulses until Kiyoko's midriff is flat and trim once more, her womb reverting to its original size over the next fifteen minutes or so.
When it's all over and your daughter pops free, she looks to be a young child of about six to seven years old — not quite the dramatic growth to maturity that some wraith-touched races of beastkin go through, but enough for Kiyoko to shake her head in wonder at the whole scene.
As for possessing unique abilities, if the wraith-touched chimaera (with her entirely physical moveset) is any indication, they don't. Speaking of her, she's clearly intelligent (albeit primitive), in contrast to the mindless husks that usually occur when a wraith encounters a normal person, which leave me wondering exactly how one becomes wraith-touched in the first place. Presumably, the wraith doesn't feed off the person (at least, not successfully), but what else is involved?
