I left university over 10 years ago, but I'm still aware of those friends who were in my year, vs others who were a year or two ahead or behind. People from my

I left university over 10 years ago, but I'm still aware of those friends who were in my year, vs others who were a year or two ahead or behind. People from my year are the ones I lived with, did group projects with, worked until midnight trying to solve a difficult task that had been set, celebrated the last exam with, etc. I certainly don't know the year for everyone. Students I mostly saw at parties, who studied different subjects (or went to different universities, for it was London) could easily be my year ±3 or more.