my cousin is dating a pedo?

Had a family event the other day and uhm, my cousin showed up late cuz she was on a date with her "boyfriend". They'd started dating recently. I was curious wassup so I asked if he was a classmate or what.

She was like, "nah he's 19"

The bitch was 15 years old. Her "boyfriend" is likely a freshman or sophomore in college. Wtf is this adult doing dating a 9th/10th grade high schooler? If she was a senior I would understand. 19 and 17/18. Sure.

But 19 and 15?? Am I overreacting?????