Tara Strong was 43 in Batman: Gotham by Gaslight when she played the character 'Marlene (voice)'.
That was over 6 years ago in 2018.
Today she is 51, and has starred in 194 movies in total, 44 of those since Batman: Gotham by Gaslight was released.
In Batman: Gotham by Gaslight, I think Tara Strong looks: