"The author is young and beautiful."
Translation:Autoarea este tânără și frumoasă.
I think it is not obvious from the English sentence that the author is female. So the translation "Autorul este tânăr și frumos." should also be acceptable.
Beautiful is not typically an adjective applied to a man in English so this does lend context. If it said The author is young and handsome it would then be the male version.