@littlek,
Mm, that's not really how it works.
The only way I can see that being the case is that the fresher your memory of sound, the more likely you are to be to be able to make use of the sound you hear through the hearing aid.
But failing to wear a hearing aid doesn't actually affect your hearing per se at all.
If anything it's more likely to go the other direction (since your ear will be subject to daily poundings of increased decibels).
What is the specific cause of your hearing loss, do you know?
Meanwhile, re: longevity, I wore mine for about 7 years with no problems, and stopped due to preference rather than anything wrong with the hearing aid. I really think the Dri-Aid (container to help dehumidify it) helped a lot.