Quoting BaDinkyDonk ™:“ i dont mean in a sexual manner. Just, sans clothing. I saw someone in another post saying its wrong ... [snip!] ... for kids to see thier parents naked, i disagree. Also, what age do you think it becomes inapporopriate? so, thoughts?”
I don't think there's any age, as long as the children are comfortable with it. I think if they get to a point where they request that you not be naked around them anymore, then you should honor that request, but if they're comfortable with it, there's no harm.