Eli5 How come “aging” food doesn’t make it spoil?

Question

Things like “dry aged” steak.

In: 69

Answer 1

I used to work in a meat department and we dry aged beef there. You use a temperature and moisture controlled hanging case. The meat does spoil on the outside. This is why when you order a dry aged cut of meat, the outside “crust” is cut off and the meat looks perfectly normal inside.