Young Ethan is a senior in high school that Monica dates in Season 1. When the two start dating Young Ethan tells Monica that he's a senior in college, and she tells Young Ethan that she's 22 even though she's 26. The truth comes out a little too late, the pair have sex and Monica confesses her lie. Unfortunately, Ethan has a lie to confess, too. Turns out he's not a senior in college... he's actually a senior in high school and he is 17.
Ethan wants to continue the relationship and tells Monica that he's in love with her, but Monica refuses to be involved with someone so young "...because it's icky."