Learn English – Can you use word “translated” as adjective

Interesting question! "transgender man" or "transgender woman" has nothing to do with how similar your features are to male or female.

A transgender man is a person who was born a female, but identifies as a male. A transgender woman is a person who was born a male, but identifies as a female.

This is actually entirely separate from what genitalia you currently have. However, these things are often on a spectrum in reality, and so there are many other terms that are sometimes used.

This is a topic that is currently evolving, but the general definitions I gave will likely stay the same.

I would say no, you can't use "prestigious" for a person. When we say that Harvard is prestigious, we mean that it confers prestige on people who go there. With that sense of the word, it doesn't make sense to describe a person as prestigious: what would that even mean?

Wiktionary suggests that typical things describable as "prestigious" include "award, prize, job, address, school, university, college, club, journal, firm, institution, office, etc." but not people.

As an alternative, you could talk about the person's high status or high reputation. I think you'd be more likely to talk about the reasons for their high prestige: e.g., if they've won a huge number of awards, you could say that they're "the most decorated person" or, if they're a sportsperson or academic, you'd tend to talk about their success in their sport or their intelligence. Other good words to use include "respected", "admired", "celebrated", "renowned", "reputable", or "eminent", as suggested by Gary Botnovcan in a comment.