Some of the most famous, and in (expensive) demand engineers are well into their fifties and older.
I refuse to believe that their magical golden ears are somehow protected from hearing loss whether age related or otherwise. Though the worst emgineer I ever had the misfortune to be limbered with (band demo in the 90s and a couple of members insisted we used this guy) was so deaf he couldn't hear obvious digital clipping.
And one of the best had ears so golden you had to shout at him all the time....