This is different for everyone. Some people keep their hearing aids for three years before replacing them and others replace them after seven years or more.
The average life of a hearing aid is five years; however, in the last three years, improvements in digital technology have been so great that some people feel the need to replace them more frequently in order to keep up-to-date so as not to miss out on the important sounds of life.
The prices have also decreased giving more people the opportunity to take advantage of good technology at a lower price. As a hearing aid ages, the receivers and microphones have a tendency to break down from moisture, wax and dry skin.
When the components break down, the hearing aid either won’t work properly or it may not work at all. Then it has to be repaired. When repaired, it makes the aid more vulnerable to future repairs because all the tiny connections wear out over time