Normal
Sorry, that I can't help you wth the height, ( I don't remember it exactly about the size of a normal one I think) but, when we took my mom - uses a walker, and also has mobility issues- on the Grand Princess, mini suite, we used the table from the balcony as a shower chair (after washing it with some bathroom cleaner that I brought with us). It was one of those white plastic ones and was perfect in the tub for her. As a back up, we bought one of the nylon folding chairs which we originally intended to use for that purpose. It was 9 dollars in Walmart and also would have worked. I am not sure it it would work for the gentleman in your group.