Selena Gomez was 14 in Horton Hears a Who! when she played the character 'Helga (voice)'.
That was over 16 years ago in 2008.
Today she is 31, and has starred in 49 movies in total, 42 of those since Horton Hears a Who! was released.
In Horton Hears a Who!, I think Selena Gomez looks: