السلام عليكم ورحمة الله وبركاته
Is dry ageing meat permissible
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
Dry-aged beef is beef that has been hung or placed on a rack to dry for several weeks.
The process changes beef by two means. Firstly, moisture is evaporated from the muscle. The resulting process of desiccation creates a greater concentration of beef flavour and taste.
Secondly, the beef’s natural enzymes break down the connective tissue in the muscle, which leads to more tender beef. 
From a Shariah perspective, as long as the animal was slaughtered according to the correct procedure, there is no prohibition in dry ageing the meat.
And Allah Ta’āla Knows Best
Mufti Muhammad I.V Patel
Checked and Approved by
Mufti Nabeel Valli
Darul Iftaa Mahmudiyyah