How common is it for high school kids to date college ‘kids’?

I know that it's very common for high school girls to date college guys, like a 14-year-old dating a 17- or 18-year-old, or a 15- or 16-year-old dating a 20- or 21-year-old. I've read from multiple people that it's so common some don't even 'bat an eye' at it. I obviously think this is gross; obviously, if you are 18 and over, you should only date people who are also 18 and older, and if you are in college, you should probably stick to dating other college students. With all that being said, it's very common for high school girls to date college guys, but how common is it for high school boys to date college girls? Is it as common? Did you see a lot of it happening in high school?