It is very individual, and depends on your lifestyle, but overall, when you feel that something in your communication with others is not smooth as always, you should have your hearing checked. Half an hour of your time, and you’ll have an answer.
BTW, the sooner, the better. We always recommend folks not to wait. The earlier you’ll start using aids (if you need, of course), the easier it will be to adjust. Assuming that your hearing loss is aged driven, your hearing isn’t likely to dramatically improve in the future.
Moreover, there is a point where you cannot start using hearing aids. Don’t wait to be at that point.
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You could also find there some additional questions we already answered.