Old is Iron Not Gold

Hence we had read a quote that Old is gold from the time period from the 60s to the 99s. But the fast technology changes the life of humans the quote became old is iron. Because every day new invention plus innovation makes the things more comfortable for human. And in the means while if we skip something in current days next coming thing will be more difficult to understand so it becomes iron. Iron is the only metal that became rusty after the time and is not useful in the future.