Gillian Jacobs was 37 in Fear Street: 1978 when she played the character 'C. Berman / Adult Ziggy'.
That was over 3 years ago in 2021.
Today she is 41, and has starred in 49 movies in total, 4 of those since Fear Street: 1978 was released.
In Fear Street: 1978, I think Gillian Jacobs looks: