In Finding Dory 2016, it shows us Dory as she was a little fish. Her voice is cuter and high-pitched. Then we see her parents. They have grown voices. Skip forward a little bit. Maybe a decade later, Dory is grown up and has her Iconic voice, but when she see's her parents they sound exactly like they did earlier in the movie. Should Filmmakers make their older characters sound older in the present, but younger in flashbacks?
Here is my question: Why do filmmakers chose to age kids' voice but keep parents' voice sound like they haven't aged at all? Wouldn't that confuse the younger audience?