The answer to this question will depend on a number of variables. Hearing aids should function well for at least four to five years. Although they may still work after this period, technological advancements as well as a change of hearing may mean that once this timeframe approaches you may benefit from new hearing aids to improve listening ability. In addition, you need to consider what type of hearing aids are being used. Factors such as illness, general health, an alteration in hearing ability or a change in lifestyle may result in needing to change your hearing aids. For example arthritis may result in deteriorating dexterity and you may no longer be able to manage controls or smaller batteries. In this situation, the option of hearing aids that have a remote control with large buttons and devices with larger hearing aid batteries may be the solution. Taking up a new sport, starting a fitness regime or changing jobs to a more dusty or humid environment may also mean you require more robust aids that tolerate moisture and dirty air. Hearing aids like many other electronic devices are exposed to the wear and tear of daily use including humidity and perspiration. These factors may require the devices to be sent away for repair or service. The service and repair fees may differ from one hearing aid manufacturer to another however a minor check of hearing aid function and cleaning the aid can cost approximately $70 and a major repair may exceed $300. Sometimes repairing old hearing aids out of warranty may be less cost effective in the long term for the user than purchasing a new set of hearing aids. Cleaning your hearing aids often and scheduling routine appointments with your audiologist will help ensure optimal performance over the lifespan of your audiological equipment.