Hint for sorting brothers (from structure person) by age- pseudocode

[enemy]

Hello!
Plese, can someone give me just a hint how to ORGANISE program (pseudocode) sorting 3 or more persons borther by age?

Many thanks!

   ...

struct person{
char name[20];
char surname[20];
int age;
};

int main(){

person brother1={...
person brother2={...


return 0;
}