Both of those are completely okay ways to age. Emma Watson played a well loved brainiac in the movies, making it very easy for her to be liked as a regular person. Also she aged on screen so it didn’t shock the world when she became an adult. Also everyone knew she wasn’t the character she played. Miley Cyrus played a pop star in a long running tv show but she also played a fictional version of herself. She did not age on screen and like pretty much every star little girls have loved there was lots of people who didn’t like her. She is now an adult. She has a different personality than the characters she played on screen and because the character she played was supposed to be her it is hard for people to accept it. 

Also the pictures chosen for this post are totally biased. Look:

Do these two pictures make them seem drastically different? And they could quickly be bias the other way.

Which one looks sweet now? So stop being a dick. Miley Cyrus is an adult who is different than the child character she played. Also in no way is she the only star that wears little clothes and acts sexual.