In the comics, Spider-Gwen is not depicted as a trans character. Her character identity is defined by other aspects of the story and her superhero persona.
In the movie, Gwen's story is quite interesting. She comes from her own dimension where she has to face various threats. She has a unique look with her white - and - pink costume. Gwen's relationship with Miles is complex. She serves as a sort of mentor and friend to him. She's been through a lot in her world, including the loss of someone close, which has shaped her into the tough and determined Spider - Woman we see in the movie. Her character adds depth to the overall story as she brings her own perspective and experiences from her dimension into the multiverse - spanning adventure.
The age of Spider-Gwen in the comics is not set in stone. However, she is commonly presented as a teenager, approximately 17 or 18 years old, as she navigates her superhero adventures while dealing with typical teenage challenges.