Blimey magsmay,slow down. Statements like that can get innocent people into trouble.
As lots of others have mentioned, each Family has it's own dynamic. My 2 Sons are 8 and 10, and would happily share a bath together, mainly because they want to splash each other and soak the Bathroom Floor. We don't let them share A Bath as they make far too much mess, but it is not because of their ages. I dont find it odd tht a 10 year old may be ok with bathing with his mother, but I do find it odd that the Mother would allow it at that age. My Boys would happily roam around the house naked if they could as nakedness does not bother them, but lately I have been making a point that they should get dressed.
I have to say, I find it a little sad that a 2 year old is not allowed in the Bathroom whilst Daddy is in the Bath/Shower because a 2 year old should not see a parent naked. I was brought up in a house whith this type of attitude, and it left it's scars. I vividly remember the horror I had to go through each week at Secondary School when we had communal showers after PE.