Quick question for mommies of multiples

Chelsea Alexis❤👑🌹 • Wife 💍 Mother of 1 👪 and baby #2 on the way 🤰🤱
My son is 5 and he has 2 friends sleeping over tonight ages 4. Are they too old to be taking a bath together?? They were asking to do so, so they could play with Josiah's bath toys lol. I asked the mom and she doesn't see an issue with it but just looking for feedback if any? Thanks in advance.