Margot Robbie was 28 in Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn) when she played the character 'Harleen Quinzel / Harley Quinn'.
That was over 4 years ago in 2020.
Today she is 33, and has starred in 41 movies in total, 9 of those since Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn) was released.
In Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn), I think Margot Robbie looks: