Tara Strong was 26 in Batman Beyond: Return of the Joker when she played the character 'Young Barbara Gordon / Batgirl (voice)'.
That was over 23 years ago in 2000.
Today she is 51, and has starred in 194 movies in total, 180 of those since Batman Beyond: Return of the Joker was released.
In Batman Beyond: Return of the Joker, I think Tara Strong looks: