[traderdoc]

Ich darf mal vereinfachen und zusammenfassen:

datetime oldest = 0;
int ticket = 0;

for(int i = 0; i < OrdersTotal(); i++){
    if(OrderSelect(i, SELECT_BY_POS)) {
        if(oldest == 0 || OrderOpenTime() < oldest) {
            oldest = OrderOpenTime();
            ticket = OrderTicket();
        }
    }
}

if (ticket > 0) OrderClose(...);

traderdoc