Is it normal that there are people of all ages in my social circle?

Over the last 3 years, I finished up my college education while simultaneously blossomed into a bigger "social butterfly" than I can ever recall being. In high school, I maybe had 2 or 3 close friends whom I would actually hang out with outside of school. Now, I did talk to other people, but they were mostly just people who i sat next to in class or at lunch. I wasn't the best at socializing then.

About 3 years ago, I was 21; a friend of my younger cousin, who was 17 then, reached out to me to hangout. I used to babysit my younger cousins, and pretty much any friends of his that were constantly at his house, so I thought of this as maybe he needed someone to confide in for whatever reason. We hung out, and well, we just connected and became friends ourselves. Since that day, I slowly got introduced to other friends of his, older than him or his age. These people came into my life, and some stayed, some stayed only temporarily.

Fast forward 3 years, I am now 24, and my social circle is pretty comfortable with trustworthy and loyal people. We all mostly hang out in unison and have similar hobbies like skateboarding, and music tastes, and video games. It's like a mix of gender too, so it's not just all guys. We have one 17 year old who is a younger relative of someone we hang with, a few 18-20 years olds, a few 21 year olds, me at 24, and a few people in their late twenties and early thirties.

My question is just... is this a normal social environment? Do other people have such a wide array of age differences in the people they call friends? I'm much interested in the comments you guys leave, and appreciate any feedback.