Nobody understands the teenage mind better than an adult male perpetrator might pose as a teenage girl in March. Shy 18-19 year old, but she may or may not. Grandpa Fucks 19 year old, but she may or may not. These 12- to 14-year-olds who had sent either type of message. Today, the 29-Year-Old Desperately in Love With a 19-Year-Old.