Depends. Now of days, you can a lot of YOUNG kids saying they are boyfriend, girlfriend, but I would not really consider that your first relationship. The normal age, however, for an actual boyfriend, girlfriend relationship would be about your freshman year in high school, which is usually around the age of 14-15.Skaterr Prep · 8 years ago.Thumbs up.2.he normal age, however, for an actual boyfriend, girlfriend relationship would be about your freshman year in high school, which is usually around the age of 14-15. Skaterr Prep · 8 years ago. Thumbs up. 2.