Agreeing with the others, that kind of age difference is most awkward when you’re younger (like yourself), but goes away as you make more friends from hobbies and work, rather than school (which is more tied to certain ages ofc).

In reality, if you gel with them, and you don’t feel like you’re taking advantage, then all’s well. Maybe you’ll be the start of a “grey wave” (hehe) of older friends in this circle.