Which FRIENDS last LONGER

I have friends from elementary that are still one of my good friends until today. Eventhough most are in different countries, we still mangage to continue the communication. I also have highschool friends that are still my friends and they are the closest of friends. I also have college friends today and they are my close friends too. I just don't know about work mates because I never tried to work yet.

To me, school mate is closer eventhough we seldom gather as we work in different places.

for me, i have my friends from elementary school as my band. they are still around and still work with me with my best first friend. they are there when i need them and mostly, i dont have college friends.