I fall in line with where you are.
There are many seniors in high school who are 19 and many freshmen who are 14 and they attend the same parties. Most 19 year olds are looking to get laid more than they are looking to drink. Besides ... just like in our days ... kids can still get alcohol fairly easy. There isn't a high school party that doesn't have it as well as other drugs.
They must do things differently in Sanford. To have many 19 year olds and many 14 year olds then many people are spending 6 years in high school. As for getting laid and drinking, they went together for me. No matter how you spin it I find it creepy and would kick my kid's ass no matter which one was them.