I won't take my 5-year old up until she's considerably older, but not for any reasons to do with her hearing.
She's already showing FAR too much interest in flying and aeroplanes generally, tells all her friends at school that "Daddy is a pilot" and I can see large bills looking in the future when she decides she wants to learn to fly.
What is that old joke? "When I grow up I want to be a pilot" - "Well, which? You can't do both"