Common symptoms of hearing loss include:
Sounds seem muffled, or when people are talking it sounds like they’re mumbling. This is because often (especially in age-related hearing loss) the high frequencies (those that make up the consonants) are the first to be affected by sensorineural hearing loss; and it's these that give clarity to speech.
Trouble hearing and understanding conversation especially in background noise like others talking or having the television or music on.
Turning the television or radio to a higher volume than you used to.