I take offense at the term 'cool'. It implies those people are better, or actually interesting.

I had various social groups in my employ - grade school friends who maintained contact with me through high school, chinese friends from grade 9, a group of girls from a grade younger, this vietnamese girl in my english class and her friends (her friend Joanne is cousins with my brother's friend), then there's marching band. On topic - I was just some invisible guy in the back. Sometimes eccentric but usually quiet. I never really developed until university.

They had things like environmental club and other clubs as I got older but I never joined. Anyway the point is I'm friends with zero of the people in my age group. All of my high school friends are my brother's friends - so around 3-5 years younger. They are more interesting people. The people who were my peers were forgettable and never bothered to keep in touch. Do not want.