I can’t much about this yet, but I’m going to look into it further. There are hints. For example, language instruction may help with learning&listening skills. For the hardware minded, you need an audio compressor to make quality over-dubs. Language and has been studied mainly in children. The subject is pregnant with intimation, but nothing substantive. According to this article, the ability to learn languages does not decline with age.
The article contains a reference regarding accommodations to hearing-impaired language learners.
The idea that learning could affect hearing probably violates certain dogmas. For age-related hearing loss, there are reasons to believe that learning could help.
Of course, all of these arguments could also apply to training on a new musical instrument. Here is a example of the kind of thing I’m talking about from the article.
The development of the receptive skills (particularly listening) before the productive skills may have much to offer the older learner.
Tantalizing that language or musical training could reverse the early onset stage. The idea is that the rudiments of age-related hearing loss could be present in the brain before symptoms appear. Such mild cases might be reversed by cognitive training, like language or musical instrument learning.
Unlike languages, there is already much evidence that musical training can help For many of us, the idea that hearing and listening skills can be cultivated is the most tantalizing. We really need an anti-aging strategy for our ears.