Tress MacNeille was 42 in The Land Before Time: The Great Valley Adventure when she played the character 'Ducky's Mom / Petrie's Mom / Mother Maiasaurus (voice)'.
That was over 29 years ago in 1994.
Today she is 72, and has starred in 138 movies in total, 112 of those since The Land Before Time: The Great Valley Adventure was released.
In The Land Before Time: The Great Valley Adventure, I think Tress MacNeille looks: