check year of age class | C code

#include<stdio.h> main() { int i,year,sum=0; int old=0,golden=0,adult=0,scence=0,young=0; for(i=1;i<=20;i++) { printf("Input Year Old %d:",i); scanf("%d",&year); sum=sum+year; if(year <15) { young=young+1; }else if(year <20) { scence=scence+1; }else if(year <40) { adult=adult+1; }else if(year <=60) { golden=golden+1; }else { old=old+1; } } printf("Young = %d\n",young); printf("Scence = %d\n",scence); printf("Adult = %d\n",adult); printf("Golden = %d\n",golden); printf("Old = %d\n",old); sum=sum/20; if(year <15) { printf("Class young!"); }else if(year <20) { printf("Scence!"); }else if(year <40) { printf("Class adult!"); }else if(year <=60) { printf("Class golden!"); }else { printf("Class old!"); } }