That was over 18 years ago in 2003.
Today she is 63, and has starred in 27 movies in total, 14 since Finding Nemo was released.
In Finding Nemo, I think Ellen DeGeneres looks:
Finding Nemo scores 7.7 out of 10 on The Movie Database.
Ellen DeGeneres' first acting role was as 'Dory (voice)' in Finding Nemo, released in 2003 when she was 45.