In high school, it can be very easy to tell your peers apart by their various ages. In college, I have realized, even if you know the ages of your peers, it is very easy to forget.
College life isn't determined by class year. Students of all years will be in your 9 a.m. class or in your 4:30 p.m. practice, and often, they become close friends.
Rarely do you realize the person from your science class who you eat lunch with might actually be two class years above you. The person who agreed with your point during that club meeting is actually a senior, but you both share similar interests and experiences.
The beautiful thing about college is that the friends you make are not dependent on your age. You share moments, develop bonds, and create friendships based on similarities. Friendships originate from a shared love of animal rights or a good lab experience. College let's you explore your interests, and it brings you near the people who want to explore, too.