Authorities on Friday said an 18-year-old man and a 17-year-old boy have been charged in the sexual assault and robbery of a woman on a Morris County recreation trail earlier this week. The adult, identified as Lizandro Osorio-Mejia, faces charges including aggravated sexual assault, sexual assault, aggravated criminal sexual contact, robbery, conspiracy to commit robbery, aggravated assault and weapons offenses, according to the Morris County Prosecutor’s Office. Osorio-Mejia’s alleged accomplice, whose name was not released because of his age, faces charges of robbery, conspiracy to commit r…