How concerning is this age gap?

My best friend is 16 and just got with a 20 year old. They've been dating 2 weeks and have known eachother about 3 months.

I finally gave in and told her how I thought about them because she just lost her virginity to him after only 2 weeks of dating. Now she's harassing me and my boyfriend who I've been with 5 months and are the same age because we haven't had sex yet saying things like "You guys are just weird" and "If he wanted to have sex you would have by now"

I'm so confused, does anyone else agree that this age gap is weird and I'm not crazy?😭

Edit: Should I call the police if she's technically the age of consent or is it still illegal bc she's under 18?