I remember when i was a kid all the beef from our butcher was aged. My pop liked everything rare. Many Sunday nights after a roast beef dinner i woke up in the middle of the night to unlesh fury in the toilet.
Back then, they used to age beef until it would have mold growing on it. My Dad told me he would see it all the time at restaurants he worked at in NYC. He has never once suggested that I try to age beef, btw. Lol.