Re: At what age is it not appropriate?
I wouldn't allow my 10 year old to shower with me, but I think it has more to do with your comfort level and the way you feel about nudity/modesty. We have young kids and while we are normally clothed around our kids, they still come to the bathroom with us, etc. To me, it would also be relative to being the same/opposite gender. For example, my 2 year old DD doesnt shower with her Dad (but we dont really shower with our kids anyway).