Motorcycles and hearing loss go hand by hand, unfortunately. So it's important to use earplugs and monitor how well you hear (or don't hear). Found and interesting free iPhone app - you can run hearing test using your phone and headphones at home or any other quiet place.
Maybe there's an Android version as well - I don't know. You can test your hearing from time to time and monitor if there's any regression.
Disclaimer - I have no idea who made this app and what they do with your medical data, so use at your own discretion.

Mimi Hearing Test
The Mimi Hearing Test is an easy and reliable assessment of your hearing, delivering understandable results in just 5 minutes. - Modern assessment: Test quickly and thoroughly a wide range of frequencies. - Instant results: Receive valuable insights from your auditory data to understand...
apps.apple.com
Maybe there's an Android version as well - I don't know. You can test your hearing from time to time and monitor if there's any regression.
Disclaimer - I have no idea who made this app and what they do with your medical data, so use at your own discretion.